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This is a color profile issue. Not all software will honor a color profile, but "it never happened before" probably indicates you exported the image differently. … would either complain about not seeing anything or that the color looked funny/inverted etc. …

Go-Junta has a good generalized answer, but for this specific image: open the channels palette delete the red and green channels set the image mode to greyscale set the image mode the RGB again (opt …

"Indexed color mode" is where the image has a palette index (a set of numbers paired with a set of RGB color definitions) and then each pixel simply refers to the index number. … (basically anything that will blend two of the swatches will result in a color that is not in the swatch list. …

Scott's comment is probably referencing the "Hue axis" of the HSB color picker. Lab is supposed to model human perception. … I think you will probably find an algorithm for coordinated color without human approval very difficult. …

OK, to formalize my comment: Make a set of base styles ("Heading"), then set "Heading - Color 1" paragraph style in each document to the option "Based on {style}" (choosing the "Heading" base style) and … then only set the color swatch. …

Not all of them will handle color well. Some will work well if you first export to PDF and then use PDF software with good color management. … Disable in-printer auto-color adjustment and us this preset every time you need to print. …

This range is common because that is the range of a single byte and RGB is perhaps most commonly 1 byte per pixel per color. Your colors are RGB(51, 173, 89) and RGB(57,192,99). …

Your current design survives even 1 color with dither. First is 1 color, second is greyscale: …

The only time I use higher than 8 bits per pixel color (16/32) is when I want to do a gradient and I want to eliminate banding. …

It sounds to me like that implementation uses all 32 bits for the decimal portion and then relies on context for scale (the exponent) or that they are leveraging a color-model (likely) that uses the same …

So 1-color instead of some rich black of, say 10,10,10,100 "rich black" can be a 25% savings on on the ink volume. clarity. … lossage associated with runnign a mutli-color job. …

The sparks are called particle effects, and you will get decent samples and/or methods for making them if you look for that term. The simplest method to make a single particle is to use a small brush, …

However: the black on the tongue looks more like a magic-wand selection; the brick background still has color in it. … In this particular case, the blue and red are very well isolated, so you simply "select color" for each, copy and paste to new layer to isolate, and then desaturate the color etc. etc. …

However, even a well-calibrated monitor will depict the actual color value differently and a "scan" of the monitor as it appears to the scanner will be different in some small but measurable way. … In addition, the scanner device will have a color bias in the resulting image that will result in changes to color. …

So select the greyscale image using the content tool, the set the color swatch to the Pantone swatch. … Select a color from the Swatches panel or Color panel. An image in PSD format can contain multiple layers, but the bottom layer must be opaque. …