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Selecting colour range then deleting the selection in another layer makes the whole layer go semi transparent

New Here ,
Mar 17, 2018 Mar 17, 2018

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I use Photoshop to create linear illustrations for screen prints.  Each layer represents a separate colour and is eventually printed separately onto polyester as a 'print positive' - effectively acting as stencil.

Sometimes I need to change a positive solid black line into a negative 'cut out' in a solid area of colour.

I have always done this by doing 'Select Colour Range' on the line, changing layer, then deleting the selection in a solid area of colour/black.

However something has changed in Photoshop and it's doing something weird.  When I delete the selection in the solid area of colour, at the same time it makes the entire layer semi-transparent. 

I have no idea why and it's driving me mad.  Can anyone help please?

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correct answers 1 Correct answer

Community Expert , Mar 17, 2018 Mar 17, 2018

That means you have more selected than you think. The "marching ants" is just the 50% boundary.

Check the preview in the Select Color Range dialog, and reduce "fuzziness".

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Community Expert ,
Mar 17, 2018 Mar 17, 2018

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That means you have more selected than you think. The "marching ants" is just the 50% boundary.

Check the preview in the Select Color Range dialog, and reduce "fuzziness".

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New Here ,
Mar 17, 2018 Mar 17, 2018

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Many thanks D Fosse.  That did work.  Because the line colour was quite pale I had to turn the fuzziness right down to get it to stop making the whole layer semi-transparent, but I found that if I converted the line into black first I could keep the fuzziness set quite high without it causing the same problem.  Not sure why though!

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Community Expert ,
Mar 17, 2018 Mar 17, 2018

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If, as you say, each color is on a separate layer (Fig 1), consider not making a tricky selection:

Lock the line layer and Edit > Fill with white (Fig 2)

Then Layer > Merge Down (Fig 3)

line.png

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New Here ,
Mar 17, 2018 Mar 17, 2018

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Thanks Norman.sanders.  It wouldn't work for my purposes though as I need the background transparent rather than white.  D Fosse's answer worked though - the problem was the lightness of the colour combined with the fuzziness setting being too high.

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Community Expert ,
Mar 17, 2018 Mar 17, 2018

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Of course! Sorry. Senior moment.

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