This is what we’re shooting for:

Threshold

The Threshold tool turns your image into a true Black and White. That is Black and White only, no shades of grey. You have to carefully choose the image you want to use this effect upon. If the image has too many colors or limited contrast, it may not work too well. However, if in doubt, open up the image and give the Threshold tool a whirl and see how it turns out, a little experimentation may find a brand new trick!

So, let’s take my original image:

You’ll notice that this image has a lot of conrtast and limited colors. It’s perfect for turning the Threshold tool loose on. Now, you’ll find the Threshold tool under Colors > Threshold…

I’ve selected the Threshold tool and am adjusting the slider to get just the effect I want. I think right about here gives good detail. Let’s go with that.

Now we have a black and white image, perfect for using the Color to Alpha tool (Alpha is a fancy name for transparent).

Color to Alpha tool

You can find Color to Alpha under Color > Color to Alpha… Let’s choose that now. Here’s a shot of the open Color to Alpha tool. I selected white in the “From … to alpha” box. As soon as I did that, all the white in the image disappeared like this:

Now we have an image that is only black, black trees. The rest of the image is transparent. Lets add a layer and move it underneath these black trees. If you look at the Layers, Channels, Paths and so on window (it’s usually on the right side of your screen looking something like this:

Let’s add another layer. I’ve circled in red the new layer button. This will add a transparent layer above the tree image. This new layer need to be placed below the trees so just click on the new layer and pull it below the original one. Voila, now you have a clean slate to lay in the background!

I chose a Hubble space telescope image for this background. I opened the space image and scaled it down to fit my tree image. Copied the space image, click on the trees again, clicked on the transparent layer and pasted the space image into it. That’s it. All that is left is a quick rotate of the whole image. I decided that I wanted it rotated to the left so I choose Image > Transform > Rotate 90 counter clockwise. Be sure and click on the finished image and view a larger size version. Much of the detail is lost with the small sizes.

Now, let’s see what you can do!

GIMP is an acronym for GNU Image Manipulation Program. It is a freely distributed program for such tasks as photo retouching, image composition and image authoring.

It has many capabilities. It can be used as a simple paint program, an expert quality photo retouching program, an online batch processing system, a mass production image renderer, an image format converter, etc.

GIMP is expandable and extensible. It is designed to be augmented with plug-ins and extensions to do just about anything. The advanced scripting interface allows everything from the simplest task to the most complex image manipulation procedures to be easily scripted.

>p>GIMP is written and developed under X11 on UNIX platforms. But basically the same code also runs on MS Windows and Mac OS X.

I since discovered that the effect was named for MIchael Orton. He sandwiched slides together. For each image, he would take two shots. One overexposed by two stops and one that was overexposed by one stop. This would produce an image that had an impressionistic sense to it. Nowadays, we don’t really need to use a tripod and take multiple shots. Most image editing programs have settings, plugins, addons and etc that could produce this same effect or it an be produced by adding layers onto an existing image.

In GIMP, the Orton Effect copies the image on two additional layers. In the first it overexposes the image and sharpens it, in the second it applies a gaussian blur.

In this photo I used the Orton Effect then added an alpha mask to the blurred layer to fade out the effect in the center of the flower allowing the sharpness to show through.

This image shows the Orton Effect without using an alpha mask.

If you have a favorite GIMP plugin or effect, please let us all know!

In the process I happened across another collection of plugins from gimphelp.org I experimented tonight with an image I took earlier in the day of an old dead tree.

Here’s the originial image:

Cutout script

Infrared Simulation

and my favorite for this image – Make Wonderful

Had a great weekend – was sunny long enough to mow down my own private Amazon rain forest, played with the cockashit and groodle outside and took a few photos. ON the down side, I’ve lost my canon camera battery charger and have turned the house upside down looking for it … no avail. I eventually ordered a new one off Ebay yesterday. In the meantime, I used my old Canon Powershot. It’s a neat sturdy little point and click but it’s cantankerous at times. Most of the shots this weekend have too much grain or noise in them even though it’s a 10 megapixel camera and I purposely don’t use the ‘zoom’.  If anyone can tell me why this little camera does this … please advise (you can see the EXIF data on the fickr link).

This is a shot of Indy (the Groodle) after he had fetched the tennis ball a few times. I edited the photo in the GIMP to try and reduce the grainy appearance by use of an alpha mask and posterising the print.

Below is the cockashit, Mojo. She’s much more difficult to photograph cause she doesn’t stay still and the camera does not like her all black features. She’s begging for me to throw the ball here.

I decided that it had been far too long since I had pulled out the ol’ camera and took some shots. I walked around this morning with my daughter and took a few experimentals. While editing them on my favorite editing software, the GIMP, I accidentally choose the Threshold option. This gives a very stark black and white image. I was impressed with how the stripes on the shirt contrasted the other elements in the composition.

I decided to use the threshold edit and layer it with an alpha mask and a circular gradiant. This pulled in color and gave me a great color and texture contrast. If all this sounds like goobledy gook and you wouldn’t know your GIMP from a lame Pimp, then check out the GMIP tutorials located on the site here. The second part of this tutorial explains the threshold tool and how to use it.

I would like to respectfully acknowledge Wurundjeri People of the Kulin Nation who are the Traditional Owners and Custodians of the land I currently reside.

The use of traditional Australian Aboriginal painting techniques and symbols have opened a new vista to artistic expression for me when combined with deep space images.

Using traditional symbols, the image depicts the future dreaming of man leaving the cradle of humanity. The concentric circles represent the ‘campsites’ or colonies as man takes to the stars. Undulating patterns mirroring trials and tribulations persist in following the journey. The U shapes of mankind identify a new civilization emerging in the stars.

The background image is a Hubble Space Telescope shot of the Orion Nebula.

Created using the GIMP opensource image editing software

For more information on Aboriginal Painting or to view real Aboriginal artists work please visit:
www.aboriginalartonline.com/index.php
www.aboriginalart.org/
en.wikipedia.org/wiki/Australian_Aboriginal_art

Note: I am not of Aboriginal descent and do not claim to understand the complexities and full symbolism of traditional Aboriginal art. I hope that by learning more about the Aboriginal culture and art I can gain a greater appreciation and understanding.

I have started experimenting with combining my love of art, especially indigenous art, with my photography. Using the GIMP, I edited one of my old photos of a butterfly garden decoration. I removed the background to the butterfly and tweeks the image curves to produce an image with nice stark contrasting lines and no background.

Using a multitude of layers, I slowly experimented with various paint brushes and tools to produce the effects I wanted. The final image background was produced by painting a green, blue and dab of white background. I then used the filter>artistic>cubism selection to create the chunky effect,

The rest was a slow and patient application of dots with the paint brush tool.

This was a test run to see what types of effects I could create. All in all, I like the concept and have a few other ideas up my sleeve. If you have any ideas or want to share your work … give me a comment below.

I mentioned in my last the GIMP tutorial, Opensource Digital Photo Processing for Novice Photographers, that I’d explore some of the more advanced features of GIMP editing later on. Using the Color>Threshold tool wouldn’t be what I call advanced by it was a tool that I didn’t mention earlier. I neglected to cover it cause I hadn’t used it. Oh, I’d explored the tool and played with it from time to time but I just didn’t have the right mind set to use it properly.

I was watching Saturday cartoons with my daughter when I noticed generous use of something like the threshold tool on one of the Sat. Morn kids shows. That gave me the impetus to sit here and experiment. Hopefully you’ll get the urge and give it a whirl too. I’d love to see what you come up with.

Here’s a couple of examples of the Color>Threshold tool. IN the above example I very simply added color to sections of the image for contrast and highlight.

In the photo below, I used a couple of layers. First I made a duplicate layer of the original. There’s a little button on the layers dialog along the bottom that creates a duplicate layer. Just hover the mouse of the little icons and you’ll find duplicate.

I then selected the duplicate layer and chose Color>Threshold. I tweeked the threshold slider until I was satisfied with the result. I then pulled out my eraser tool and went to work. At first I didn’t like the results so I kept fiddling with the eraser size and settings. And Voila …

As mentioned earlier, I’d love to see your results or better yet, learn a better technique from you.

GIMP is an acronym for GNU Image Manipulation Program. It is a freely distributed program for such tasks as photo retouching, image composition and image authoring.

It has many capabilities. It can be used as a simple paint program, an expert quality photo retouching program, an online batch processing system, a mass production image renderer, an image format converter, etc.

GIMP is expandable and extensible. It is designed to be augmented with plug-ins and extensions to do just about anything. The advanced scripting interface allows everything from the simplest task to the most complex image manipulation procedures to be easily scripted.

GIMP is written and developed under X11 on UNIX platforms. But basically the same code also runs on MS Windows and Mac OS X.

Download the latest version of the GIMP

Tools of the Trade

Camera

Any digital camera will work. I have used, and continue to use, a number of digital cameras(Canon A340 Powershot, Canon A640 Powershot and a Canon EOS 400D). I still play around with the first one I bought over four years ago. It’s a boxy Canon Powershot (A360) that takes photos at 3 megapixels. It has a horrible zoom but takes a pretty good wide angle shot. My three year old has decided this is her camera now so it now gets a pretty good lickin’. She’s very good at taking pictures of her feet while sitting in the car.

Seriously, anything from your mobile phone to the best digital SLRs will work here.

Computer

I have no delusions about my own computer equipment – basically it sucks. The point here is that you don’t need a you beaut computer system to create good images. I still work on a PIII 633 Gateway machine that I bought around 7 years ago. It is a dinosaur but I manage to make it work by NOT using memory and processor intensive programs like those made by Microsoft. I run the old machine on Linux, specifically Zenwalk Linux. If I have you intrigued and you want to know more about Linux go check out Linux.com.

The biggest investment you can make in your computer is to ensure you’ve got a healthy supply or RAM and decent hard drive space. If you’re unsure about these characteristics of your computer, seek the advice of your nearest geek (or give me a shout).

Software

Many people do one of two things to their images after they download them to the computer. 1. Nothing – they leave them as they are or 2. They use Adobe Photoshop to edit them. I’m not going to cover editing your photos with Photoshop cause it costs way too much cash for me to legally afford and, this tutorial is about getting good picts with little money. So, if you don’t already have a working copy of the GIMP on your computer, rush over here and download a copy – it’s free

GIMP runs on just about any operating system (Windows, Mac OS X and Linux).

Now We’re Ready to Go

OK, I’ll assume you have the GIMP correctly installed on your computer, that you are able to download your photos from your camera or phone and you have made yourself a nice cup of tea before we begin.

Let’s Open a Photo

Fire up the GIMP and select File>Open. Navigate to an image you want to play with. I’ll work on one I took earlier this year. I was chasing my three year old around the house when I quickly stopped and snapped this picture of an aloe vera plant.

You may look at your photo and think that you’d like to trim it just a bit to center your subject or create better ‘framing’. The GIMP has a nice crop tool in the tool bar. It’s the one that looks like a scalpel. If your unsure, just hover your mouse over the GIMP tool icons until one of the labels identifies it as the Crop Tool.

I love the Crop Tool. One thing to keep in mind when using Crop – if you’re planning on printing your photos, be sure and keep the photo ratio in tact. The ratio is the width/height ratio. After you select the Crop Tool, you’ll notice a small check box labeled Fixed : with a drop down menu afterwards. Check the box next to fixed and I’d recommend you select Aspect ratio from the adjacent drop down box.

That’ll allow you to crop your photo and retain it’s ratio or shape. Remember, if you accidentally make a mistake or do something you don’t like with the GIMP, there’s always the Edit>Undo option.

Basic Adjustments

Now we’ll move on to some of the basic adjustments you can make that can enhance your photo quickly. Under the Color menu above your GIMP image, you’ll find lots of handy tools. For the examples, I’ll start with the basic aloe.jpg photo then add the the tool under discussion for a demonstrated effect. Often you will want to combine several of these photo tweeks but for my examples, I’ll keep adjustments simple. I’d encourage you to explore all of the options and variations and be sure and check out the GIMP manual. Let’s try the Level adjustment first.

Levels

The Level tool can change the intensity range of the photo. This tool is used to make an image lighter or darker, to change contrast or to correct a predominant color cast. When you select the Colors>Level tool, a histogram box will pop up. You’ll notice a small slider just under the histogram. Grab the slider and move to the right and left and notice the difference it makes to your photo. Here’s my photo where I’ve adjusted the slider to the right. It has given the aloe photo a darker, richer look.

Curves

The Curves tool is the most sophisticated tool for changing the color, brightness, contrast or transparency of the active layer or a selection in your photo. If you’re unsure what that means, no worries, I’ll walk you through using the tool in a minute. While the Levels tool allows you to work on Shadows and Highlights, the Curves tool allows you to work on any tonal range.

OK, now select Color>Curves on your photo. You’ll get a neato grid with a grey histogram and a line going from the lower left to the upper right. Again, it all looks complicated but let’s make an easy adjustment and see what it does to the image.

First, click in the middle of the angular line and pull the line down slights with your mouse. You’ll notice your photo is looking alot like it did when we used the levels tool. Now comes the fun bit … hang on … click on an area of the line you have just pulled down (it’s now more of an arc than an angled line) to the right of the mid point. Pull this part of the curved line up just a little.

Watch what happens to your photo. Click below the mid point of your arc and pull the line down a little. See the changes?

You should experiment with this tool for awhile and get get the general feel for manipulating the ‘curve’ to produce results.

Let’s move on to playing with color.

Hue-Saturation

Select Color>Hue-Saturation on your photo. Here’s more configuration razzle dazzle. What’s worth playing with are the three sliders sitting under the bold heading Adjust Selected Color. I’ll grab the Saturation slider and give it a good yank to the right … oh ahhhh …. my aloe becomes very green. But I won’t stop there. I’ll now push the Hue slider around. Well, maybe I went too far, here’s the aloe very Saturated and over Hued!

I’ll give it another go because I noticed that while playing with the sliders I could bring out a nice red color on the spines of the aloe. I like that.

Speaking of color, let’s do more.

Colorize

Colorize is a great way to put a color tone or wash over the photo. Sometimes it has a great effect, other times, no so much. Select Color>Colorize on your photo. You’ve got a selection of sliders again. Go like mad and see what effect they produce. For the aloe.jpg, I’ve selected a nice blue tone with a slight twist of saturation. Do you like it?

The final tool in our down and dirty Color menu that I’ll demonstrate is the Color Balance.

Color Balance

Go for Color>Color Balance. Wow, surprise, you get some more sliders. Three in fact. On top of the sliders you even get a selection of radio buttons. I hope that by this stage you have overcome some of the hesitation and fear about jumping in and experimenting with your photos. Jump in with reckless abandon and work some color magic. I ended up with this lovely fire aloe.

So that’s it for the quick tweeks in the Color Menu. I want to show you one final essential trick in my arsenal before moving off these photo enhancements. Let’s have a crack at sharpening your photo.

Sharpening

In GIMP you have a couple of options if you want to sharpen your image. The first is a straight forward Filters>Enhance>Sharpen move. It’ll do an auto sharpen on your image. But, hey, who wants to do anything automatically when we can play with sliders? Ditch the auto crap and let’s pull out the big one Filters>Enhance>Unsharp Mask. Like all the other tools, I’m sure you’d benefit from carefully reading the GIMP manual to grasp all of the idiosyncrasies of the Unsharp Mask – I’m sure I would. But, if your like me, you’ll just start pushing things around and rely on the preview to guide you.

I’ve kept the fire aloe from the previous tool and went straight to the Unsharp Mask. Here’s the stark results.

This is a little over kill but you get the general idea. Right? Just for Kicks, here’s the original aloe.jpg using Unsharp Mask.

That’s all of the enhancements that’ll I’ll show you this go around. There’s heaps more you can do like using image burn, alpha masks, spot colorizations and more that I’ll run down in later tutorials.

Now that you have played around with your photo, you should be able to put together a combination of some of the above techniques to feel quiet satisfied with the result. Here’s my aloe.jpg.

If I remember correctly, I used Level, Hue-Saturation, and Unsharp Mask to get the final.

So now what are you going to do with your image? If you’re gong to print it … then your basically done. If you are posting it to the internet or you want to add a frame to it. Here’s a simple frame technique.

Frame

Here we go. First create a new layer. You can find the new layer button in the Layers Dialog Box. If you don’t have a Layers Dialog box floating around your screen click on the GIMP tool panel. Select File>Dialogs>Layers or you can try pressing CTRL + L (works on my machine). OK, now you have the Layer Dialog box in front of you, run your mouse along the little icons at the bottom. The first one should say something like ‘create a new layer ….’ when you hover over it with the mouse. Click Create a New Layer.

Go back to your photo and select all. You can either go to the menu Select>All or just press CTRL + A. Have a look back at you GIMP tool panel. See the color boxes below the other tools. It is probably showing a black and white box. Click the top box and select what ever color you want your border or frame to be. I’ll use white for the aloe.

Now go to menu Edit>Stroke Selection. In the dialog box give your photo a healthy line width. Remember you can have a few goes to get the right width. I usually use something between 70 to 120 on full sized images. Of course, with smaller images, you’ll use much smaller widths. When you’ve added a value in the width department, hit stroke selection. Do you like the look? If not, use your undo command (Edit>Undo).

Now you have a nice frame around your photo.

I recommend that you upload your photo to a artists/photographers community website such as deviantart or redbubble. I found that by pitching my photos out there for others to see and comment upon, I learned and gained more confidence. I also recommend that you seek out photographers that you admire and you ‘watch’ them. A lot can be learned from just watching what a good photographer produces as well as having the opportunity to interact and seek advice from them.

If you do head over to deviant art or redbubble, be sure and look me up and give me a yell. I’d love to see what you can do littleredplanet @ deviantart and littleredplanet @ redbubble.

It’s that simple … and better yet, it costs next to nuthin!

Part 2 – Using the threshold tool in the gimp

GIMP is an acronym for GNU Image Manipulation Program. It is a freely distributed program for such tasks as photo retouching, image composition and image authoring.

It has many capabilities. It can be used as a simple paint program, an expert quality photo retouching program, an online batch processing system, a mass production image renderer, an image format converter, etc.

GIMP is expandable and extensible. It is designed to be augmented with plug-ins and extensions to do just about anything. The advanced scripting interface allows everything from the simplest task to the most complex image manipulation procedures to be easily scripted.

GIMP is written and developed under X11 on UNIX platforms. But basically the same code also runs on MS Windows and Mac OS X.

Download the latest version of the GIMP