# How to participate in image-processing challenges if the language does not support images?

Is participating in image-processing challenges allowed, if the language does not support images? If it is allowed, what shall the input format be?

Related question where this issue came up in the comments.

• It's not the first time this problem arises; I'm shocked to learn that there is no meta post about this. – Leaky Nun Jun 4 '16 at 16:16
• @LeakyNun That's not really the case. There's this which shows some support for allowing matrix input for image processing challenges. – Martin Ender Jun 6 '16 at 8:39

However, clearly it is impractical to expect answers to rewrite an implementation of PNG for every challenge. A popular image format that I've used and seen used on PPCG is Netpbm, which is extremely easy to parse; images can be converted to and from .p*m with Imagemagick (convert) or a similar tool.