Re: [Gimp-developer] Modify alpha transparency of selected pixels?

[Rob Antonishen]

on Sat, Jun 25, 2011 at 1:13 PM, Jeremy Morton wrote:

> Hi all,
>
> Several times now it has occurred to me that it would be useful to be
> able to modify alpha transparency of pixels selected.  I can already
> modify their colour in numerous ways (brightness/contrast, colorize,
> invert, etc.) so why not alpha transparency?  Right now, the way you
> have to do it is clunky.  You select the pixels, 'cut' them, paste them
> onto a new layer, modify that layer's transparency, and merge it down
> into the original layer again.  Why not add some functions to increase
> selected pixels' opacity, reduce it, or set them to a given value (0-255)?
>
>
You can also use the curves/levels dialogs on the alpha channel directly to
accomplish all those tasks.

-Rob A>
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Re: [Gimp-developer] Modify alpha transparency of selected pixels?

[Jeremy Morton]

Ah thanks... that works quite nicely.

-- 
Best regards,
Jeremy Morton (Jez)

On 25/06/2011 18:49, Mikael Magnusson wrote:
> On 25 June 2011 19:13, Jeremy Morton  wrote:
>> Hi all,
>>
>> Several times now it has occurred to me that it would be useful to be
>> able to modify alpha transparency of pixels selected.  I can already
>> modify their colour in numerous ways (brightness/contrast, colorize,
>> invert, etc.) so why not alpha transparency?  Right now, the way you
>> have to do it is clunky.  You select the pixels, 'cut' them, paste them
>> onto a new layer, modify that layer's transparency, and merge it down
>> into the original layer again.  Why not add some functions to increase
>> selected pixels' opacity, reduce it, or set them to a given value (0-255)?
>
> Add Layer Mask ->  transfer alpha channel
>
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Re: [Gimp-developer] Modify alpha transparency of selected pixels?

[Tobias Ellinghaus]

Am Samstag, 25. Juni 2011 schrub Jeremy Morton:

[...]

> > you can use masks on selected pixels
> 
> I don't see how that lets you actually set the pixel's alpha value,
> though.  You have to mess around with the mask getting its pixels just
> the right value to make the pixel's alpha value right, which is probably
> harder than using the cut/paste/merge method I mentioned previously.
> What I really want to be able to do is enter a number and set the
> selected pixels' alpha transparency to that number.

You can enter that number in the colour dialog and fill the mask with the 
resulting colour. Since you already selected the pixels the mask will only be 
changed for those.


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Re: [Gimp-developer] Modify alpha transparency of selected pixels?

[Jeremy Morton]

On 25/06/2011 18:41, Fabio Gonzalez wrote:
>
>
> 2011/6/25 Jeremy Morton mailto:ad...@game-point.net>>
>
> Hi all,
>
> Several times now it has occurred to me that it would be useful to be
> able to modify alpha transparency of pixels selected.  I can already
> modify their colour in numerous ways (brightness/contrast, colorize,
> invert, etc.) so why not alpha transparency?  Right now, the way you
> have to do it is clunky.  You select the pixels, 'cut' them, paste them
> onto a new layer, modify that layer's transparency, and merge it down
> into the original layer again.  Why not add some functions to increase
> selected pixels' opacity, reduce it, or set them to a given value
> (0-255)?
>
> --
> Best regards,
> Jeremy Morton (Jez)
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>
> you can use masks on selected pixels

I don't see how that lets you actually set the pixel's alpha value, 
though.  You have to mess around with the mask getting its pixels just 
the right value to make the pixel's alpha value right, which is probably 
harder than using the cut/paste/merge method I mentioned previously. 
What I really want to be able to do is enter a number and set the 
selected pixels' alpha transparency to that number.

-- 
Best regards,
Jeremy Morton (Jez)
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Re: [Gimp-developer] Modify alpha transparency of selected pixels?

[Mikael Magnusson]

On 25 June 2011 19:13, Jeremy Morton  wrote:
> Hi all,
>
> Several times now it has occurred to me that it would be useful to be
> able to modify alpha transparency of pixels selected.  I can already
> modify their colour in numerous ways (brightness/contrast, colorize,
> invert, etc.) so why not alpha transparency?  Right now, the way you
> have to do it is clunky.  You select the pixels, 'cut' them, paste them
> onto a new layer, modify that layer's transparency, and merge it down
> into the original layer again.  Why not add some functions to increase
> selected pixels' opacity, reduce it, or set them to a given value (0-255)?

Add Layer Mask -> transfer alpha channel

-- 
Mikael Magnusson
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[Gimp-developer] Modify alpha transparency of selected pixels?

[Jeremy Morton]

Hi all,

Several times now it has occurred to me that it would be useful to be 
able to modify alpha transparency of pixels selected.  I can already 
modify their colour in numerous ways (brightness/contrast, colorize, 
invert, etc.) so why not alpha transparency?  Right now, the way you 
have to do it is clunky.  You select the pixels, 'cut' them, paste them 
onto a new layer, modify that layer's transparency, and merge it down 
into the original layer again.  Why not add some functions to increase 
selected pixels' opacity, reduce it, or set them to a given value (0-255)?

-- 
Best regards,
Jeremy Morton (Jez)
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