When converting from RGB to YUV and vice versa there are multiple sets of coefficients that can be used. The most common are Rec.709, FCC, Rec.601 (aka SMPTE 170M or ITU-R BT.470-2), and SMPTE 240M. The purpose of ColorMatrix is to recalculate the values of a YUV video that has been converted from RGB using one set of coefficients to what the values would be had it been converted from RGB using a different set of coefficients.
The reason this is useful is that MPEG-2 streams typically use Rec.709, whereas most computer software (XviD/DivX decoders, etc…) assumes Rec.601. Thus, if you take an MPEG-2 stream using Rec.709 and pass it as YUV to a decoder which upsamples to RGB using Rec.601 the colors will be slightly off.
In this case, you could use ColorMatrix to convert the video from Rec.709 to Rec.601 and then pass it to the decoder. Another example is if you capture video with software that uses Rec.601 and then want to encode it to MPEG-2 using an encoder that assumes Rec.709.
At first glance, it would appear that to accomplish its task ColorMatrix would need to internally convert to RGB using the source coefficients and then convert back to YUV using the new coefficients. However, this is not the case. What colormatrix actually does is compute the inverse matrix of the source coefficients (gives a matrix for doing YUV->RGB) and then multiplies that matrix with the new coefficient matrix. This gives a set of coefficients for doing the conversion directly from YUV to YUV.
The ColorMatrix filter supports YV12 and YUY2 colorspaces, and can convert between Rec.709, FCC, Rec.601, and SMPTE 240M. ColorMatrix also has the ability to do range expansion and contraction ([16,235/240]->[0,255] or [0,255]->[16,235/240]) as part of the colorimetry conversion or on its own.
ColorMatrix Crack + For Windows
(X) = source coefficients for converting from YUV to RGB
(I) = inverse matrix for the source coefficients
(Y) = target coefficients for converting from YUV to YUV
(XI) = inverse matrix for the target coefficients
(YY) = target coefficients for converting from RGB to RGB
[16,235/240] = conversion of Rec.709 source coefficients to Rec.601 target coefficients (normal)
[0,255] = conversion of Rec.709 source coefficients to Rec.601 target coefficients (invert)
[255,16] = conversion of Rec.709 source coefficients to Rec.601 target coefficients (expand)
[128,128] = conversion of Rec.709 source coefficients to Rec.601 target coefficients (contraction)
Note: ColorMatrix is specified by the Rec.601 (and Rec.709) standard. The SMPTE 240M video standard specifies a similar filter which produces similar results as ColorMatrix, however it does not support conversion between Rec.709, and SMPTE 240M.
Test Video
First thing first: Assuming your test video is encoded in Rec.709, the conversion coefficients would be:
[16, 240, 235, 0, 128]
If the test video is encoded in Rec.601, the conversion coefficients would be:
[0, 128, 128, 0, 256]
A quick test of this with ffmpeg has produced the following results:
ffmpeg -i testvideo.yuv -c:a copy testvideo.yuv -f colorconv -e “10,256,0,255,1” testvideo.rgb
ffmpeg -i testvideo.yuv -c:a copy testvideo.yuv -f colorconv -e “1,0,128,128,0” testvideo.rgb
ffmpeg -i testvideo.yuv -c:a copy testvideo.yuv -f colorconv -e “10,240,235,0,128” testvideo.rgb
ffmpeg -i testvideo.yuv -c:a copy testvideo.yuv -f colorconv -e “1,0,128,128,0” testvideo.rgb
Note that only the last command above actually does what it advertises: converting from Rec.709 to Rec.601. The first two are (surprisingly) completely useless.
ColorMatrix [2022]
The ColorMatrix Free Download filter accepts a [00×00] or [XXxXX] color matrix string as input. The matrix can be in two parts: the upper half is a hexadecimal color string specifying the matrix (which can be set in or out) for the YUV colorspace transformation. The lower half is a hexadecimal number string specifying the matrix (which can be set in or out) for the RGB colorspace transformation. The upper half is optional, and the lower half is optional. If left empty, it defaults to the standard Rec.709 values (1.0 for Y, 0.0 for U, V). The 0.5 values give a 50/50 split of the incoming values (inclusive).
Each part of the ColorMatrix Product Key can be specified as either 0x00 for the input, 0x11 for the output, or 0x22 for the dual input/output.
If the hexadecimal string consists of just 0x (which is equivalent to 0x00), the hexadecimal value is interpreted as an RGB value (like the first case described above), and if the string is given as just 0x22, the hexadecimal value is interpreted as a YUV value (like the second case described above).
If the lower half of the matrix string is an integer, it is interpreted as a linear matrix (same as applying the command COLOR_MATRIX in the value assigned to the COLOR_MATRIX filter) and the upper half is optional. If the upper half of the matrix string is an integer, it overrides the linear matrix.
If the lower half of the matrix string is a decimal number, then this is interpreted as an absolute matrix for every component of the R/G/B components (assume [00×00] or [XXxXX]):
0000 1101 0100 1100 1101 0100
b7e8fdf5c8
ColorMatrix
“rec709” and “fcc” are the same set of coefficients as the sRGB color space, and are the recommended sets if the algorithm is being used as part of a calibration process.
“sce” is the set of coefficients from SMPTE 240M (SMPTE.2084-1996) that are equivalent to rec709. (Click the “Show Details” link to see the SMPTE 240M coefficients in text format.)
“itu-r-bt470-2” is the set of coefficients of the ITU Rec.601 video format.
A:
The ColorMatrix filter has no effect on the decoder. It does not affect what is being decoded (a video file), nor does it change the color space of any other filter.
If you have a YUV video, you can input that into the decoder (e.g. libavcodec), and it will output a full color video. In fact, it will not understand YUV input, it will produce an RGB video. It does not understand other video formats. To decode a YUV video from another format (e.g. another input from another camera), you will need to use another filter.
A:
The answer from the docs on the W3C wiki:
For more information about ColorMatrix, see the Rec. 709 standard, and the Rec. 601 and Rec. 601-2 standards.
The colorimetry calculator is an internal Matroska/WebM implementation of the transforms in Section 15.7, “Colorimetry Calculation”.
When I tried running your code there was a result on YUV buffer, and input RGB buffer would be normal and expected.
———————– ————– ————– ————– ————– ————– ————–
**Low dose**
What’s New in the ColorMatrix?
The coefficients are in the form:
(sx, 0, sy, 0, sz, 0)
Coloring this matrix is a process of multiplying a YUY2
yv12_coefficients matrix by this matrix. If (x,y) are
the coefficients from the matrix, then
(x, y, 0, 0, 0, 1)
(0, 0, y, x, 0, 0)
(0, 0, 0, y, x, 0)
(0, 0, 0, 0, y, x)
represents (x, y, 0, 0, 0, 1) in the YV12 space. Note that
when (y, x) = (1,0), we have (x, y, 0, 0, 0, 1) =
(1, 0, 0, 0, 0, 1) = (1, 0, 0, 0, 0, 0), which is (1,0,0,0,0,0).
In other words, when the matrix becomes the identity matrix,
colormatrix reverses colors between YV12 and YUV.
(For more info about the YUV->YV12->YUV process, see the
description of the ColorMatrixFilter.)
Example:
The input matrix is
[0.5, 0.0, 0.0, 0.0, 0.0, 0.0]
The output matrix is
[0.984022, 0.0, 0.0, 0.0, 0.0, 0.0]
[0.0, 1.000093, 0.0, 0.0, 0.0, 0.0]
[0.0, 0.0, 1.000026, 0.0, 0.0, 0.0]
[0.0, 0.0, 0.0, 1.000008, 0.0, 0.0]
[0.0, 0.0, 0.0, 0.0, 1.000057, 0.0]
[0.5, 0.0, 0.0, 0.0, 0.0, 0.0]
[0.0, 0.984022, 0.0,
System Requirements:
Minimum:
OS: Windows 7 (SP1) / Windows 8 / Windows 8.1
Processor: Intel Core 2 Duo @ 2.2GHz or AMD Phenom X2 @ 2.4GHz / Intel Core 2 Quad @ 2.4GHz or AMD FX-8100 @ 3.7GHz
Memory: 4GB RAM
Graphics: Radeon HD 5870 / Nvidia GTS 450
DirectX: Version 9.0
Network: Broadband Internet connection
Hard Drive: 300 MB available space
Additional Notes: Some
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