On Mon, Apr 25, 2022 at 9:16 PM Michael Koch <astroelectro...@t-online.de> wrote:
> Hi, > > I have some remarks and questions about the new "colorchart" source and > "colormap" filter. > > In "colorchart" is a small error in the yellow field. It should be 231, > 199, 31. > Source: > https://www.xritephoto.com/documents/literature/en/ColorData-1p_EN.pdf > > "colorchart" is missing in the table of contents of the documentation. > > Could you please also add an option for the chinese version which has > slightly different colors? > Source: https://www.aliexpress.com/item/32738129067.html > The RGB values are shown in the 5th picture. Code is below. > > In "colormap" I'd like to know how the color from the "source" image is > calculated. If a real image of a ColorChecker is used, then the borders > between the fields must somehow be excluded. > Center pixel of patch is picked, that is fastest way. There is separate software for processing real world colorcharts. (Dealing with geometric transformation and color averaging) > Is the average color over the whole 64x64 field used? Or is only one > pixel used, from the center of the 64x64 field? Or is it the average > color over a smaller area, for example the central 24x24 pixels? > > Michael > > > > static const uint8_t ref_china_colors[][3] = { > { 115, 82, 69 }, // dark skin > { 204, 161, 141 }, // light skin > { 101, 134, 179 }, // blue sky > { 89, 109, 61 }, // foliage > { 141, 137, 194 }, // blue flower > { 132, 228, 208 }, // bluish green > > { 249, 118, 35 }, // orange > { 80, 91, 182 }, // purple red > { 222, 91, 125 }, // moderate red > { 91, 63, 123 }, // purple > { 173, 232, 91 }, // yellow green > { 255, 164, 26 }, // orange yellow > > { 44, 56, 142 }, // blue > { 74, 148, 81 }, // green > { 179, 42, 50 }, // red > { 250, 226, 21 }, // yellow > { 191, 81, 160 }, // magenta > { 6, 142, 172 }, // cyan > > { 252, 252, 252 }, // white > { 230, 230, 230 }, // neutral 8 > { 200, 200, 200 }, // neutral 65 > { 143, 143, 142 }, // neutral 5 > { 100, 100, 100 }, // neutral 35 > { 50, 50, 50 }, // black > }; > > _______________________________________________ > ffmpeg-user mailing list > ffmpeg-user@ffmpeg.org > https://ffmpeg.org/mailman/listinfo/ffmpeg-user > > To unsubscribe, visit link above, or email > ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe". > _______________________________________________ ffmpeg-user mailing list ffmpeg-user@ffmpeg.org https://ffmpeg.org/mailman/listinfo/ffmpeg-user To unsubscribe, visit link above, or email ffmpeg-user-requ...@ffmpeg.org with subject "unsubscribe".
