What is the difference between perceptual and relative colorimetric

The white point is the location of the purest and lightest white in a color space also see discussion of color temperature. If one were to draw a line between the white and black points, this would pass through the most neutral colors. Relative colorimetric skews the colors within gamut so that the white point of one space aligns with that of the other, while absolute colorimetric preserves colors exactly without regard to changing white point.

To illustrate this, the example below shows two theoretical spaces that have identical gamuts, but different white points:. Absolute colorimetric preserves the white point, while relative colorimetric actually displaces the colors so that the old white point aligns with the new one while still retaining the colors' relative positions. The exact preservation of colors may sound appealing, however relative colorimetric adjusts the white point for a reason.

Without this adjustment, absolute colorimetric results in unsightly image color shifts, and is thus rarely of interest to photographers. This color shift results because the white point of the color space usually needs to align with that of the light source or paper tint used.

If one were printing to a color space for paper with a bluish tint, absolute colorimetric would ignore this tint change. Relative colorimetric would compensate colors to account for the fact that the whitest and lightest point has a tint of blue. Saturation rendering intent tries to preserve saturated colors, and is most useful when trying to retain color purity in computer graphics when converting into a larger color space. If the original RGB device contained pure fully saturated colors, then saturation intent ensures that those colors will remain saturated in the new color space — even if this causes the colors to become relatively more extreme.

Saturation intent is not desirable for photos because it does not attempt to maintain color realism. Maintaining color saturation may come at the expense of changes in hue and lightness, which is usually an unacceptable trade-off for photo reproduction. On the other hand, this is often acceptable for computer graphics such as pie charts. Another use for saturation intent is to avoid visible dithering when printing computer graphics on inkjet printers.

Some dithering may be unavoidable as inkjet printers never have an ink to match every color, however saturation intent can minimize those cases where dithering is sparse because the color is very close to being pure.

One must take the range of image colors present into account; just because an image is defined by a large color space does not mean that it actually utilizes all of those extreme colors. If the destination color space fully encompasses the image's colors despite being smaller than the original space , then relative colorimetric will yield a more accurate result.

The above image barely utilizes the gamut of your computer display device, which is actually typical of many photographic images. If one were to convert the above image into a destination space which had less saturated reds and greens, this would not place any image colors outside the destination space.

For such cases, relative colorimetric would yield more accurate results. This is because perceptual intent compresses the entire color gamut — regardless of whether these colors are actually utilized. Real-world photographs utilize three-dimensional color spaces, even though up until now we have been primarily analyzing spaces in one and two dimensions. Although a lot of people only upload images to Instagram from their smartphones, the app is much more than just a mobile photography platform.

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Submit a News Tip! Reading mode: Light Dark. Login Register. Best cameras and lenses. All forums Printers and Printing Change forum. Started Mar 26, Discussions thread. IIRIC the speaker also says the the best thing is to make some tests, anyway.

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My least favorite line. Re: My least favorite line. Relative colorimetric vs perceptual. Fulvio Senore. Re: Relative colorimetric vs perceptual. SoCal Dave. Re: fft81 - I agree! Mark McCormick. Tank you for the info nt. Forum Parent First Previous Next. Color scheme? Latest sample galleries. Tamron mm F2. Panasonic S 35mm F1.

DJI Mavic 3 Cine sample gallery. Nikon Z9 pre-production sample gallery. Watch it carefully. To deliver very saturated colors, it may lighten an image or shift the hue of specific colors. Both side-effects can be compensated for with output specific adjustments. Relative Colorimetric Use a relative colorimetric rendering intent for printing images where the luminosity structure is most important.

You may get slightly less saturated colors but brightness values will be most stable with this rendering intent. This makes it the ideal choice for near neutral and black and white images. Absolute Colorimetric Use an absolute colorimetric rendering intent for making a proof of one device on another, like making a proof of an offset press on an inkjet printer.

Saturation Use a saturation rendering intent for eye-catching graphics where color impact is more important than color accuracy , like pie charts. It will so much saturation it will distort continuous tone images in an adverse way. Perceptual A perceptual rendering intent preserves the overall color appearance by changing all colors in the source space to fit the destination space.