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H
H-HH-254
Participant
December 5, 2019
Question

Different RGB values from eyedropper tool on region coloured by specific RGB values with pencil tool

  • December 5, 2019
  • 2 replies
  • 323 views

Hi. I'm doing pixel-level re-touching on a small image. I'm finding within a number of files that within the same file (.png) that if I apply a specific RGB colour pixel-by-pixel using the pencil tool, and then use the eyedropper tool on it (right-clicked and it's set to "point sample"), the RGB values that the eyedropper tool picks up from the region I've just coloured are slightly different from what I specifically set for the pencil tool to apply. Any ideas?

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2 replies

PECourtejoie
Community Expert
PECourtejoieCommunity Expert
Community Expert
December 5, 2019

Hello, is the blending mode of the pencil tool Normal, its Opacity at 100%? nothing on top? RGB file?

H
H-HH-254Author
Participant
December 13, 2019

Hi. Thanks both. It seems to be something with the original files (.png) I'm working on, because if I start a new file and then copy and paste the source file image as a new layer then everything works OK in that new file. The files have all been created elsewhere and I've been sent them. With the pencil tool selected, the Mode drop-down list in the main toolbar doesn't give me the option to select 'Normal' - just 'Threshold' and 'Dissolve' available, but 'Behind' and 'Clear' are shown just below them in the list but won't let themselves be selected. Opacity is set to 100%. There is only one layer, named "Index". I'll complete the remaining few files for now by copying and pasting each into a new file as a new layer and adjusting them there, but for general future use it would be good to try to understand why this has been happening. Any ideas why the "Normal" setting for the pencil tool isn't available in the drop-down list for 'Mode'?

Chuck Uebele
Community Expert
Chuck UebeleCommunity Expert
Community Expert
December 5, 2019

As careful as you might be, the eye dropper might be partially sampling a neighboring pixel.

 

Edit: I just ran a test placing a color sampler at .25 increments. I didn't get any reading from neighboring pixels. I also tried using the pencil tool, and couldn't reproduce your error.

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