Magic Wand Tolerance in Photoshop – a bug??

A
Posted By
Arek
May 3, 2005
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285
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Please take a look at a sample file at http://www.mikro.net.pl/test.jpg There are four circles of slightly different colours.
The second circle from the left has RGB values of 100, 100, 100 and the olive one has 113,114,80.

According to what Deke McClelland writes in his Photoshop Bible, when I select a Magic Wand, set Tolerance to 32 and click the second circle (100,100,100), the wand should select all pixels with the colors from the following range: (68,68,68 – 132,132,132). All the circles in the picture belong to this range. Unfortunately the olive one is not being selected. Why?

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Colin D
May 4, 2005
Arek wrote:
Please take a look at a sample file at http://www.mikro.net.pl/test.jpg There are four circles of slightly different colours.
The second circle from the left has RGB values of 100, 100, 100 and the olive one has 113,114,80.

According to what Deke McClelland writes in his Photoshop Bible, when I select a Magic Wand, set Tolerance to 32 and click the second circle (100,100,100), the wand should select all pixels with the colors from the following range: (68,68,68 – 132,132,132). All the circles in the picture belong to this range. Unfortunately the olive one is not being selected. Why?

I haven’t met this problem as yet, but I think the quoted range is actually a tolerance of 64 (132 – 68). A tolerance of 32 would have a range of 116 – 84, so would ignore the olive circle at 113,114,80, because of the 80.

Try setting the tolerance to 40 or 41 and see if that will encompass the olive circle.

Colin

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