For the second issue, I would suggest opening a click and/or keypress
to open a second window. Where the user would be able to select which
channels (s)he wants to see (maybe all of them in a rectangular array
within that window).

On 5 March 2013 17:20, Ulrich Pegelow <[email protected]> wrote:
> Hi!
>
> Under the hood this would be quite easy to implement. Not for 1.2,
> because it would violate string freeze.
>
> Still I see two issues. First, I am not so convinced users can make a
> lot out of the single channels, e.g. when it comes to a and b of Lab.
> These channels - when translated into display format - will mostly be
> neutral gray with some lighter or darker areas. But of course YMMV.
>
> The second issue is our already quite cluttered GUI. If we want to offer
> this option we need to have another GUI element to activate
> single-channel display and we need some option to select which of the up
> to 14 single channels to show. Currently I can't imagine a way without
> making the GUI so complicated that it will shy away even the bravest newbie.
>
> Ulrich
>
> Am 04.03.2013 19:58, schrieb Alexander Wagner:
>> Hi!
>>
>> Just a suggestion.
>>
>> blendif() is pretty powerful, but at least to the uninitiated a bit
>> difficult to use as it requires to visualize the image decomposed to
>> it's channels to see where which ones to use and where to put the
>> sliders. One can work around with the colour picker of course but it's
>> quite a wilde guessing if a or R is a better choice e.g.
>>
>> At least to me it was always quite helpful to decompose an image in Gimp
>> to various channels as gray scale to see which one might give a good
>> mask for a potential blendif. (E.g. though there is a pretty nice Lab
>> sharpen plugin for the Gimp I tend to decompose, sharpen & blur and
>> recompose instead, as I have a better feeling for what's going on.)
>>
>> I think it would be a great help to those willing to learn if dt could
>> just display an images per channel, thus display the channel structure
>> by means of grayscale images. IMHO this would make an educated selection
>> of channels quite a bit easier if you're not used to see an L channel
>> instead of a full image.
>>
>> I'm not sure if this is easy to do though.
>>
>
>
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