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DevIL and FreeImage horribly slow at saving PNG files

Started by soconne Mar 30, 2009 at 11:29 PM 1 replies 2.5k views

Original Post

Mar 30, 2009 at 11:29 PM


ILuint image;
ilGenImages(1, ℑ);
ilBindImage(image);
ilTexImage(width, height, 1, 4, IL_RGBA, IL_BYTE, pixels);
ilEnable(IL_FILE_OVERWRITE);	
ilSave(IL_PNG, "output.png");
ilDeleteImages(1, ℑ);

The code above for some reason takes 6s to execute for a 2800 x 3400 image. It only takes 300ms to load the same sized image from disk. But to save it, takes forever using both DevIL and FreeImage. I've tried the same thing in C# and it takes 1.3s to save to disk. Anybody know what's going on? I noticed the resulting PNG file size is 6MB, whereas the original input image was around 760KB.

PinguinDude

Mar 30, 2009 at 11:41 PM

It probably has to do with the compression type you're passing over to DevIL. PNG Is a compressed image format.

Physics

Apr 11, 2009 at 2:04 PM

It's probably slow for both libraries, because they use libpng. I'll see if there's anything I can do to speed it up in DevIL.

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