First, I'm poor. I can't afford to buy Photoshop. EDIT: This might be in the wrong section, but i don't see art questions -_-
Second, It there a filter where it allows me to choose two colors that are allowed to show? (Like, for instance, Orange and transparent.)
Threshold does the job, but it's only black and white.
You can use the select by colour tool after you do the threshold and then just fill the selections with any colour you want.
[editline]02:32PM[/editline]
Then there's also a neat little trick you can do if you want to antialias the threshold.
Load up an image, then scale it up (bigger is better, 4x scaling works pretty well).
[img]http://www.shrani.si/f/1/WP/1OJjBNNh/tut1.png[/img]
Apply threshold.
[img]http://www.shrani.si/f/Q/1g/3Lv0Ge8p/tut2.png[/img]
Scale down to original size.
[img]http://www.shrani.si/f/2K/11a/2Q1ifim1/tut3.png[/img]
BAM! The edges are nice and smooth now.
[img]http://www.shrani.si/f/2G/v9/2ZDQsSXh/tut4.png[/img]
Now onto coloring. The select by colour tool won't work well here since you have many different shades of gray inbetween the black and white. It would destroy the antialiasing. First make 2 new layers with the colours you want in your final image and add a layer mask to the top layer.
[img]http://www.shrani.si/f/3s/RV/27sM5bQ9/tut5.png[/img]
Copy the thresholded layer into the layer mask.
select the thresholded layer>ctrl+c>click on the layer mask of the top layer>ctrl+v>anchor the pasted layer
[img]http://www.shrani.si/f/E/P3/M9hYHi5/tut6.png[/img]
That's it! Now you can tweak the colours if you want to. If you have colours the wrong way around, click on the layer mask then go to colors>invert
[img]http://www.shrani.si/f/2L/Cs/2vk7xEVa/tut7.png[/img]
[highlight]IMPORTANT NOTE: when scaling the images to antialias the threshold, use linear interpolation and integer scaling factor to minimise interpolation artifacts! [/highlight]In this example i scaled the image up by 4x (from 1024x768 to 4096x3072) and then back to original size. This method works similar to how a graphics card antialiases images in games. The bigger scaling factor you use, the better antialiasing will be. 4x scaling is equivalent to 16x AA( every pixel from the final image is an average of 16 pixels from the upscaled version)
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