HSL Colour Picker Tool Bug

[Salty Dan]

Edit: See comment below by anon2 for an explanation of this behaviour.

- - - - -

When selecting a colour using the Colour Picker Tool, and then applying it to another shape, the values change slightly.

This seems to happen when HSL is selected in the Colour Panel, but not when CMYK is selected.

It seems to happen with a number of different values, although not all of them.

I've replicated the problem with multiple objects, and multiple colours, on both Publisher (1.8.1) and Designer (1.8.1). I don't have Photo to attempt it with that app.

Currently running Catalina 10.15.2

I've posted this in the Publisher Bug forum also, so it's visible to people who search there. If someone can replicate it on Photo it might be worth posting there too?

[lepr]

That's not a bug; it's a result of the designed behaviour of the Colour panel.

The Colour panel's eyedropper does not directly obtain the colour of an object in the document; it samples the colour of a pixel in the rendered composite of the document. In your example, a CMYK colour is sampled because your document is CMYK, regardless of the colour mode of an attribute (such as the fill colour) of some particular object in that document.

Your Colour panel's mode is HSL with the lock engaged, so when you transfer an eyedropper sampled CMYK colour to the panel's active colour (fill or stroke well), the active colour is an HSL conversion from the sampled CMYK, and that active HSL colour will be applied to any currently selected object.

After the colour transfer, your destination object's HSL colour does not exactly match the source object's HSL colour because the destination was given an HSL colour that was converted from a CMYK colour that was a rendering of a source HSL colour.

You can use the Copy command and Paste Style command to exactly transfer colours, or use swatches.

[Salty Dan]

Thanks anon2, I wasn't aware this was what was happening! I appreciate you taking the time to explain all that, as well as the options I'd have to make use of.

Also, apologies for the misunderstanding.