Questions about colors, different color space, RGB or CMYK color model, transparent color, using or changing colors.

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5
votes
2answers
343 views

Why are certain colors more prone to compression artifacts than others?

I most often see this with compressed video, but I've also seen it often enough with JPEG images. Many times blacks, reds, and other generally dark colors seem to be especially prone to compression ...
31
votes
9answers
14k views

What is the difference between CMYK and RGB? Are there other color spaces I should know?

I'm a photographer, who dabbles in graphic design from time to time as well. What are the differences between the various color spaces?
32
votes
13answers
1k views

What web graphics formats to use?

Web sites can contain JPEG, GIF,PNG, SVG format graphics. Which ones should be used, and when?
43
votes
5answers
5k views

Are “web-safe” colors still important?

Years ago, it was always strongly recommended that web designers should only use web-safe colors. Have studies been done to see if this is still the case? If so, what's the answer? Edited to add… ...
7
votes
1answer
635 views

Contrast ratio between foreground and background

What is an acceptable contrast ratio between a foreground and its background?
10
votes
4answers
474 views

Do high-content areas of a website need to be white/light-colored?

Many websites that are designed to be easy to read (eg. nytimes.com or ilovetypography.com) use white backgrounds with black fonts to make the content easy to read. Is it necessary to only use light ...
32
votes
8answers
2k views

Sources for Color Theory or Psychology of Color

Does anyone have a recommendation for a good book/blog/forum that focuses on design principles such as psychology of color, specifically where it relates to picking a color palette for a communication ...
19
votes
8answers
92k views

How do I change a single layer to grayscale in Photoshop CS4?

I know you can have the whole image turn grayscale: Image > Mode > Grayscale, but what if I only want to make specific layers grayscale? There's gotta be an easier way than pulling out the ...