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This commit is contained in:
harukasan 2015-01-09 18:01:51 +09:00
parent c356a8c12f
commit fab8f03740
5 changed files with 28 additions and 16 deletions
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10
webp/yuva_image.go
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@ -4,10 +4,16 @@ import "image"
// YUVAImage represents a image of YUV colors with alpha channel image.
//
// We can not insert WebP planer image into image.YCbCr,
// because image.YCbCr is not compatible with ITU-R BT.601, but JFIF/JPEG one.
// YUVAImage contains decoded YCbCr image data with alpha channel,
// but it is not compatible with image.YCbCr. Because, the RGB-YCbCr conversion
// that used in WebP is following to ITU-R BT.601 standard.
// In contrast, the conversion of Image.YCbCr (and color.YCbCrModel) is following
// to the JPEG standard (JFIF). If you need the image as image.YCBCr, you will
// first convert from WebP to RGB image, then convert from RGB image to JPEG's
// YCbCr image.
//
// See: http://en.wikipedia.org/wiki/YCbCr
//
type YUVAImage struct {
Y, Cb, Cr, A []uint8
YStride int