P: Magnetic Lasso can not be used on Layer Mask?

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LEGEND ,
Jun 21, 2011 Jun 21, 2011

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When attempting to use a Magnetic Lasso on Layer Mask, while viewing the Layer Mask content, the following Warning appears:


Image is not available



is this intended?

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correct answers 1 Correct answer

Adobe Employee , Apr 12, 2012 Apr 12, 2012
We've made it so using the magnetic lasso tool can now be used on Layer Masks in Photoshop CS6. #2904586

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Adobe Employee ,
Jun 21, 2011 Jun 21, 2011

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Hmm. Looks like it's expecting non-alpha data to compute what it needs to compute. Chris would know more. I would say it's intended, even though it's unexpected from the user view. It might be that the warning is just a poor choice of words.

Senior Product Manager - Customer Advocacy - Digital Imaging

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LEGEND ,
Jun 21, 2011 Jun 21, 2011

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Thanks Jeffrey. What do you think would be the intention here if it in fact was intended. From the user point of view (is there any other ? ;), this seems unintuitive?

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Adobe Employee ,
Jun 21, 2011 Jun 21, 2011

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My guess: The intention is that the tool needs color information to calculate the magnetic effect. Agree, from the user point of view and the cryptic message, that it's unintuitive. An engineer would need to look at the code to tell exactly what's going on under the hood. We'll look into it.

Senior Product Manager - Customer Advocacy - Digital Imaging

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LEGEND ,
Jun 21, 2011 Jun 21, 2011

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Great! This would be a great addition to otherwise excellent selection tool.

As far as 'the tool looking for the color information', I was trying to find an information how exactly this tool works, but I could not find anything in depth.

I always thought it reads the pixel values from individual channels within the tool radius and then calculates the difference between the highest and lowest value at tool's mid point to establish the selection border?

Do you know how it works Jeffrey? Thanks.

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Adobe Employee ,
Jun 21, 2011 Jun 21, 2011

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I don't. Like I said, someone would have to look at the code. (The magnetic lasso tool's been around for a long time, so who knows which engineer implemented it. Thomas Knoll? Mark Hamburg?)

Senior Product Manager - Customer Advocacy - Digital Imaging

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LEGEND ,
Jun 21, 2011 Jun 21, 2011

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File a bug, I think I'm the last one who touched that code.
Oh, and Scott Byer implemented it.

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Community Expert ,
Jun 21, 2011 Jun 21, 2011

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Isn't this enough of a bug report Chris?? with a smile!!

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LEGEND ,
Jun 21, 2011 Jun 21, 2011

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We have an internal bug tracking system. It's important to get the bug in there so we can make sure to do regression testing. (that, and so my manager doesn't think I'm just goofing off and fixing random bugs)

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Adobe Employee ,
Jun 22, 2011 Jun 22, 2011

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Geoff, Chris's comments were directed at me. One of our QE (Jeanne) has this on her plate to log in the internal system on the AM.

Senior Product Manager - Customer Advocacy - Digital Imaging

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Adobe Employee ,
Jun 23, 2011 Jun 23, 2011

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This is now logged in our system.

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LEGEND ,
Jun 23, 2011 Jun 23, 2011

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And relatively easy to fix...

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LEGEND ,
Jun 23, 2011 Jun 23, 2011

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It was disabled because normally the layer mask hides composite color data, and the edges should be calculated for the visible color data. So the layer mask is excluded from the calculations. But someone failed to make a special case for when *just* the layer mask was visible.

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LEGEND ,
Jun 24, 2011 Jun 24, 2011

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Makes a perfect sense Chris. I'm glad this gets addressed.

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Adobe Employee ,
Apr 12, 2012 Apr 12, 2012

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We've made it so using the magnetic lasso tool can now be used on Layer Masks in Photoshop CS6. #2904586

Senior Product Manager - Customer Advocacy - Digital Imaging

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LEGEND ,
Apr 13, 2012 Apr 13, 2012

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Great!

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