Diff Magic Wand Tolerance vs Flood Fill Tool Tolerance?

[pstein]

I oftentimes scan paper based articles with a flatbed scanner.

Then I use PSP X2 to make the light grey, dusted background in the scanned *.jpg files much more (pure) white.

Therefore I perform two steps:
1. Enable and apply Magic Wand Tool with Tolerance = 22 and feather=0
2. Enable and apply Flood Fill with Tolerance=22 and with Opacity=100

Questions:

What is the difference between Tolerance and Feather option in Magic Wand? I cannot really figure out the difference.

What is the difference between the Tolerance in Magic Wand and in Flood Fill?
Do I need Magic Wand at all or is Flood Fill with appropriate Tolerance enough (=the same)?

Thank you
Peter

[migf1]

Hello Peter,

I'm not 100% sure but I think that common options (such as Match-Mode and Tolerance) should work similarly under both tools.

However, the Magic Wand gives you more control over your selection (like Anti-alias, Feather, Non-Contiguous, etc, along with all the menu commands under Selections -> Modify), which in many cases make it easier to specify what you will flood-fill and how.

[LeviFiction]

Tolerance happens when selecting colors. Feather happens after the colors have been selected. Feathering expands the selection by a few pixels in a gradation to make the edges of the selection softer. Tolerance determines how closely a pixel color must match the sampled color with 0 being an exact match.

If you use the magic wand tool you limit the available pixels to fill, and if you then sole with the flood fill tool using a different pixel sample the may or may not be the same as the flood fill tool has fewer pixels to check. Hard to say.

If you want to test it. Duplicate the layer two times. On the middle layer perform the magic wand and flood fill. Then on the top layer perform the flood fill only. Change the top layer's blend mode to difference. If it shows color variations those are where the pixels are different. If there is no variation then the result is more or less the same.

[Jean-Luc]

Then I use PSP X2 to make the light grey, dusted background in the scanned *.jpg files much more (pure) white.

See also this discussion:
https://forum.corel.com/viewtopic.php?p=373528