Hi!
Attached patch improves decoding this image, reported by Ulf Zibis:
http://samples.ffmpeg.org/image-samples/flower-separated-contig-16.tif
Please comment, Carl Eugen
From 7e98c7167f62506ed726780a1f32216515f4e29f Mon Sep 17 00:00:00 2001
From: Carl Eugen Hoyos
Date: Sat, 9 Mar 2019 11:05:36 +0100
Subject: [PATCH] lavc/tiff: Support decoding 16bit cmyk.
---
libavcodec/tiff.c | 16
1 file changed, 16 insertions(+)
diff --git a/libavcodec/tiff.c b/libavcodec/tiff.c
index 112f5b5..828ed9e 100644
--- a/libavcodec/tiff.c
+++ b/libavcodec/tiff.c
@@ -1547,6 +1547,22 @@ again:
}
dst += p->linesize[plane];
}
+} else if (s->photometric == TIFF_PHOTOMETRIC_SEPARATED &&
+s->avctx->pix_fmt == AV_PIX_FMT_RGBA64BE) {
+dst = p->data[plane];
+for (i = 0; i < s->height; i++) {
+for (j = 0; j < s->width; j++) {
+uint64_t k = 65535 - AV_RB16(dst + 8 * j + 6);
+uint64_t r = (65535 - AV_RB16(dst + 8 * j)) * k;
+uint64_t g = (65535 - AV_RB16(dst + 8 * j + 2)) * k;
+uint64_t b = (65535 - AV_RB16(dst + 8 * j + 4)) * k;
+AV_WB16(dst + 8 * j, r * 65537 >> 32);
+AV_WB16(dst + 8 * j + 2, g * 65537 >> 32);
+AV_WB16(dst + 8 * j + 4, b * 65537 >> 32);
+AV_WB16(dst + 8 * j + 6, 65535);
+}
+dst += p->linesize[plane];
+}
}
}
--
1.7.10.4
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