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For a project dealing with deep semantic labeling of images I need a format that supports arrays of arbitrary length for each pixel of the image.

The array is an array of integers.

Which image formats support this?

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    $\begingroup$ Does the array length vary per-pixel? $\endgroup$ – Mokosha Jul 11 '16 at 13:42
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    $\begingroup$ How many bits are the integers? 32? 64? $\endgroup$ – Larry Gritz Jul 12 '16 at 22:04
  • $\begingroup$ array length vary per-pixel, 32 bit integers. $\endgroup$ – smuseus Jul 14 '16 at 8:37
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OpenEXR might be a good fit. You can have an arbitrary number of channels per pixel and the data types for each channel can be integers.

http://www.openexr.com/

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Probably .dds. You can store there textures array or 3d texture both can be use as array per pixel. You can try creating this textures with DxTex from DirecX SDK. Also you can look in Legacy Texture Tools from Nvidia https://developer.nvidia.com/legacy-texture-tools

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  • $\begingroup$ Since the OP said "array of integers" without qualifying the number of bits, it perhaps seems safe to assume they mean a C-style 'int' (at least 32 bits). Does DDS support 32 bit integer channels? $\endgroup$ – Larry Gritz Jul 12 '16 at 22:05
  • $\begingroup$ Also note that since the OP did not specify that they were Windows-only, DDS may be a bit of a problem on other platforms, where few tools will properly read or write them. $\endgroup$ – Larry Gritz Jul 12 '16 at 22:06
  • $\begingroup$ According to MSDN DDS Format Overview: Note that the DDS format supports any valid DXGI_FORMAT value... so it support 32 bit integer. But yes, DDS may be problem on other platforms. $\endgroup$ – Derag Jul 13 '16 at 11:27

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