Color and the quality of the image information
Happy new year
Digital images color corrections seem to be more and more important nowadays,
and as part of the workflow, I understand the relationship between the color information and the quality of the image correctly.
Photoshop CC IPC States that thereon:
Format JPEG retains all color information in an image, but it compresses the file size by selectively deleting data.
More compression, the better the image.
Does this mean that the quality of the image changes by the compression level (for example, JPEG), even if the same tonal RGB or CMYK range information is kept for the image in a file, regardless of the level of compression?
Unable to find information on this in the help.
Answers would be appreciated as always,
EAD
JPEG splits RGB in Y of Luminance and Chrominance Cb, Cr
(by more precise nomenclature: coded inverse gamma numbers r 'B').
JPEG compression does not fear the lines of Luminance and Chrominance.
JPEG reduced the number of levels of tones of the scale, less for Y, more for Cb, Cr nets;
mainly by reducing higher frequency components.
http://en.Wikipedia.org/wiki/JPEG
http://docs-Hoffmann.de/jpeg131200.PDF
Cordially - Gernot Hoffmann
Tags: Photoshop
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