cs Color Space
srgb: Default (Internet standard)
adobergb1998: Adobe’s RGB standard for screen and print
tinysrgb: Smaller RGB profile developed at Facebook.
strip: Removes all color profile information.
cs parameter specifies the color space of the output image. Changing or removing the color space information from the image can help decrease file size, especially for smaller images such as thumbnails where color profile information is a larger percentage of the total file size.
srgb refers to the sRGB color space, which is the standard on the Internet, and
adobergb1998 refers to the Adobe RGB (1998) color space, which provides accurate color reproduction from screen to print. The
tinysrgb value reduces the color space information but may cause a slight shift in color values, and
strip removes it completely for maximum file size savings.