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5 votes

Two colors whose shades are perceived as equally dark?

Let us imagine that the numbers (100) are the number of photons shooting out of the screen into your eyes. By simply comparing the values of color (100,100,100) vs (0,0,100) we see that the screen is ...
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  • 33.3k
5 votes
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Change colour of an image

Because the image essentially has no colour [black/white/grey are not considered 'colours' for this] then Preview cannot do anything useful with it. You can make it swing the tint between greenish &...
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4 votes
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What process has been used to derive these "tints"?

A tint of an RGB colour would be calculated by merging it with white, at various opacities. There is a formula for this, courtesy of User: JBE on Stack Overflow, and this answer here. newR = currentR +...
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2 votes

How can i trim the artwork

Assuming the circles are on top of everything else... Select all the circles Choose Object > Compound Path > Make from the menu. This forces Illustrator to see the circles as one, singular ...
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  • 197k
2 votes

Why are even displays with high or complete specific color space coverage not correctly calibrated?

Each monitor is unique in how many hours its been used, where it has been stored in etc. In addition each monitor is used in different background settings. So even if each monitor left the factory the ...
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  • 55.1k
1 vote

Change colour of an image

Yes you can do this with just Preview. The following method is a bit hacky, but reasonably straight forward: Open the file with Preview and bring up the Adjust Colour tool adjust the temperature to ...
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1 vote

Where can I find a large palette / set of contrasting colors for coloring many datasets on a plot?

Here's a set I devised, of 26 maximally distinct RGB values (28 if you include black and white). It is also a colour alphabet. It differs from the colour alphabet of Peter Green-Armytage and the 22 ...
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1 vote

Shift white to a color like the hue tool can

In the next single layer image there's drawn a pure white scribble on black. The transparency of the white varies. It's fully opaque in the middle and its opacity reduces to zero towards the edges: ...
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  • 50.4k

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