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Make conversion from RGB8 to RGB16 more accurate - xscreenshot - screen capture… |
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git clone git://git.codemadness.org/xscreenshot |
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commit 09f10196b609f477adfd6d1692508434954c3566 |
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parent b0165f794fa7eee32c3c29933f60d05e122e9c4d |
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Author: z3bra <willyatmailoodotorg> |
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Date: Tue, 17 Nov 2015 22:40:45 +0100 |
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Make conversion from RGB8 to RGB16 more accurate |
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Each value has to be multiplied by 257 (65535/255), and not left-rotated |
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by 8 bits. Thanks FRIGN! |
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Diffstat: |
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M xscreenshot.c | 6 +++--- |
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1 file changed, 3 insertions(+), 3 deletions(-) |
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--- |
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diff --git a/xscreenshot.c b/xscreenshot.c |
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@@ -76,9 +76,9 @@ main(int argc, char *argv[]) |
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for (h = 0; h < (uint32_t)img->height; h++) { |
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for (w = 0; w < (uint32_t)img->width; w++) { |
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tmp = XGetPixel(img, w, h); |
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- rgba[0] = htons((tmp & img->red_mask) >> 8); |
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- rgba[1] = htons(tmp & img->green_mask); |
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- rgba[2] = htons((tmp & img->blue_mask) << 8); |
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+ rgba[0] = htons(((tmp & img->red_mask) >> 16) * 257); |
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+ rgba[1] = htons(((tmp & img->green_mask) >> 8) * 257); |
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+ rgba[2] = htons((tmp & img->blue_mask) * 257); |
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rgba[3] = htons(65535); |
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if (fwrite(&rgba, 4 * sizeof(uint16_t), 1, stdout) != … |
