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Annoying printers
On Wed, 03 Oct 2018 19:39:26 +0100, Wolf K wrote:
On 2018-10-03 14:19, Jimmy Wilkinson Knife wrote: On Wed, 03 Oct 2018 16:54:01 +0100, Jonathan N. Little wrote: Jimmy Wilkinson Knife wrote: On Tue, 02 Oct 2018 20:27:53 +0100, nospam wrote: In article , Jimmy Wilkinson Knife wrote: For true grey-scale printing with an ink jet, you need at least two inks, a black and a grey. Creating grey scale has been a problemin the printing trade ever since half tones were invented. Look up duotone printing. Most inkjets don't have grey. Using colours won't help to create greys. actually, it does. multiple greys are better, but mixing cmy is an alternative. Less black makes grey. Yes, but there are different greys. In graphics there is 'black' and 'rich black'. The former is 'knockout black' where other colors are masked and only black ink is deposited, and the later is 'overprint black' where black is printed over color inks. CYMK 0,0,0,100 vs 100,100,100,100. The same goes for greys. Using color makes different shades of greys, warm greys and cool greys. Except I didn't want any of those, I asked for a non-colour image. Not possible. Read up on additive and subtractive colours, and colour perception. BTW, you know the black wax crayons you used when you were a kid? They're not actually black, as you can determine for yourself by streaking a bit of black crayon across the paper, then adding a solvent to dilute the wax. A truly black wax crayon isn't possible, because it would have to be basically solid carbon. The colour in wax crayons is dye, not pigment. A pigment "crayon" is termed a pastel crayon/stick. Just noticed, if I print from Excel, it only uses black. But if I print something similar from a photo program, it uses colours, even thought the output is identically black. Excel is therefore a lot faster to print. |
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