These challenges involve processing pre-existing image files, by altering them in some way, gathering statistics, or other image processing tasks.

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19
votes
3answers
759 views

Hiding information in Cats

You are a secret agent trying to communicate with your fatherland. Of course the information needs to be hidden so no one eaves drops your message. What would be better suited than a cat? Everyone ...
0
votes
1answer
403 views

“How many squares can you see?” [closed]

Sorry, guys, I understand that this is a low quality post, so please cast your close votes. Intro: Perhaps we all have come across "How many squares are there in the picture?" puzzles. (Right?) ...
24
votes
17answers
2k views

Output an image of your source code (not-quite-a-Quine)

Code golf: Print an image of the source code. Requirements Must output the image of the source code itself, not a version stored elsewhere and retrieved at run time. Code must be legible enough ...
11
votes
4answers
341 views

Recognize ASCII art numbers

Challenge Recognize ASCII art numbers. To make things interesting, three random points in the image might be flipped. For example: ***** * ** ** ** ** ** Input A 7x7 ...
11
votes
3answers
492 views

Freehand red circles

Over on http://meta.stackoverflow.com, we have a few memes of our own. One of them is Freehand Red Circles. See this post: So, the challenge is, can you draw freehand red circles... with code? ...
7
votes
4answers
519 views

Produce the number 2014 from an image

In the 2014 challenge, Michael Stern suggests using OCR to parse to 2014. I'd like to take this challenge in a different direction. Using built-in OCR from the language/standard library of your ...
32
votes
8answers
2k views

Encode Images into Tweets (Extreme Image Compression Edition)

Based on the very successful Twitter image encoding challenge at Stack Overflow. If an image is worth 1000 words, how much of an image can you fit in 114.97 bytes? I challenge you to come up with a ...
4
votes
4answers
287 views

Determine which of two ImageMagick .TXT images is more saturated

You have two images (64x64 pixels each): Your program must take the file names of each of them as command line arguments and determine which has more average saturation among their pixels. The ...