Color Picker x Sample Point

[Krikor]

(11-24-2021, 08:48 AM)rich2005 Wrote: Same as previous, except more complicated colours so now a definite zoom in to pixel level before comparing values. Keep options the same for all, sample average off, sample merged on

rich2005,

I needed to analyze your images from the previous post to understand why the whole thing works in your examples while I got different results.

After studying and understanding the issue better, everything seems very simple.

My problem was a misconception. I had a total misunderstanding of how the Sample Average Radius for the Color Picker tool worked.

I thought:
- With a radius of 1, 1 pixel would be selected;
- With a radius of 2, 4 pixels would be selected;
- With a radius of 3, 9 pixels etc would be selected.

Ehhh I know... ridiculous, noob thing. (what would it be without the Sample Average option checked being selected?)  

I realized that actually:
- Without the Sample Avarage option checked - 1px x 1px;
- Radius 1 --> 3px x3 px;
- Radius 2 --> 5px x 5px;
- Radius 3 --> 7px x 7 px, etc.
   
In other words, Pointer works the same way as Color Picker with sample average off. (This is now so clear!)

BTW:

Some people use a technique to blur the image when using Sample Points. Thus, they collect a more homogeneous sample from the chosen point.

Pat David in one of his many excellent articles wrote:
"It would be nice if there were an option for Sample Points to allow an adjustable sample radius (if there is an option I haven't found it yet)."

https://pixls.us/articles/color-curves-m...e%20Points

Perhaps using Color Picker (with Sample Average ON) is the option for these situations.

rich2005, thank you so much for the super clarification!