Fast image RGB to BGR conversion

Question

I need to perform conversion of images from BGR to RGB image format and also backward conversion. I found Simd Library which contains function SimdBgrToRgb which performs fast conversion from BGR to RGB. But I didn't find any function for backward (RGB to BGR) conversion.

Maight any to know any C/C++ library which allows to perform this conversion?

The same function goes backwards as well. It swaps B and R, the opposite of a swap is that same swap — harold, Jun 12 '19 at 12:34
The documentation you linked even says "also it performs backward conversion". — molbdnilo, Jun 12 '19 at 12:38
@William Unless the meaning of English words have changed dramatically recently, yes. (Note that the documentation for the result parameter is obviously wrong, though.) — molbdnilo, Jun 12 '19 at 12:42
Equally, you could potentially use the somewhat more mainstream OpenCV library which has SIMD-optimised `cvtColor(image,COLOR_BGR2RGB)` — Mark Setchell, Jun 12 '19 at 15:34

score 7 · Accepted Answer · answered Jun 12 '19 at 12:35

7

For 24bpp images, it's the same shuffle: reverse 3-byte chunks. For 16bpp 5:6:5 image formats, it's again the same shuffle with symmetry around the middle field.

Use any of the existing BGR to RGB functions you found.

answered Jun 12 '19 at 12:35

Peter Cordes

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Fast image RGB to BGR conversion

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