PixelFormat
Specifieds a particular format of an archetypes.Image.
Most images can be described by a datatypes.ColorModel and a datatypes.ChannelDatatype,
e.g. RGB and U8 respectively.
However, some image formats has chroma downsampling and/or
use differing number of bits per channel, and that is what this datatypes.PixelFormat is for.
All these formats support random access.
For more compressed image formats, see archetypes.EncodedImage.
Variants variants
Y_U_V12_LimitedRange = 20
Y_U_V12 is a YUV 4:2:0 fully planar YUV format without chroma downsampling, also known as I420.
This uses limited range YUV, i.e. Y is expected to be within [16, 235] and U/V within [16, 240].
First comes entire image in Y in one plane, followed by the U and V planes, which each only have half the resolution of the Y plane.
NV12 = 26
NV12 (aka Y_UV12) is a YUV 4:2:0 chroma downsampled form at with 12 bits per pixel and 8 bits per channel.
This uses limited range YUV, i.e. Y is expected to be within [16, 235] and U/V within [16, 240].
First comes entire image in Y in one plane, followed by a plane with interleaved lines ordered as U0, V0, U1, V1, etc.
YUY2 = 27
YUY2 (aka 'YUYV', 'YUYV16' or 'NV21'), is a YUV 4:2:2 chroma downsampled format with 16 bits per pixel and 8 bits per channel.
This uses limited range YUV, i.e. Y is expected to be within [16, 235] and U/V within [16, 240].
The order of the channels is Y0, U0, Y1, V0, all in the same plane.
Y8_FullRange = 30
Monochrome Y plane only, essentially a YUV 4:0:0 planar format.
Also known as just "gray". This is virtually identical to a 8bit luminance/grayscale (see datatypes.ColorModel).
This uses entire range YUV, i.e. Y is expected to be within [0, 255]. (as opposed to "limited range" YUV as used e.g. in NV12).
Y_U_V24_LimitedRange = 39
Y_U_V24 is a YUV 4:4:4 fully planar YUV format without chroma downsampling, also known as I444.
This uses limited range YUV, i.e. Y is expected to be within [16, 235] and U/V within [16, 240].
First comes entire image in Y in one plane, followed by the U and V planes.
Y_U_V24_FullRange = 40
Y_U_V24 is a YUV 4:4:4 fully planar YUV format without chroma downsampling, also known as I444.
This uses full range YUV with all components ranging from 0 to 255 (as opposed to "limited range" YUV as used e.g. in NV12).
First comes entire image in Y in one plane, followed by the U and V planes.
Y8_LimitedRange = 41
Monochrome Y plane only, essentially a YUV 4:0:0 planar format.
Also known as just "gray".
This uses limited range YUV, i.e. Y is expected to be within [16, 235].
If not for this range limitation/remapping, this is almost identical to 8bit luminace/grayscale (see datatypes.ColorModel).
Y_U_V12_FullRange = 44
Y_U_V12 is a YUV 4:2:0 fully planar YUV format without chroma downsampling, also known as I420.
This uses full range YUV with all components ranging from 0 to 255 (as opposed to "limited range" YUV as used e.g. in NV12).
First comes entire image in Y in one plane, followed by the U and V planes, which each only have half the resolution of the Y plane.
Y_U_V16_LimitedRange = 49
Y_U_V16 is a YUV 4:2:2 fully planar YUV format without chroma downsampling, also known as I422.
This uses limited range YUV, i.e. Y is expected to be within [16, 235] and U/V within [16, 240].
First comes entire image in Y in one plane, followed by the U and V planes, which each only have half the horizontal resolution of the Y plane.
Y_U_V16_FullRange = 50
Y_U_V16 is a YUV 4:2:2 fully planar YUV format without chroma downsampling, also known as I422.
This uses full range YUV with all components ranging from 0 to 255 (as opposed to "limited range" YUV as used e.g. in NV12).
First comes entire image in Y in one plane, followed by the U and V planes, which each only have half the horizontal resolution of the Y plane.
Arrow datatype arrow-datatype
uint8