Coloring images with transparant parts

> Hi all,
>
> I have a .png or .gif image (e.g. an ImageMorph) with transparent parts
> (e.g. a circle where the outer part is transparent). I now want to have
> this one image and color it programmatically with other colors (e.g. the
> circle appearing in slight red, green, blue ...).
>
> Is this possible to do with Squeak/Morphic? How?
>
> Thanks,
> Matthias
> _______________________________________________
> Beginners mailing list
> [hidden email]
> http://lists.squeakfoundation.org/mailman/listinfo/beginners
>

> Hi all,
>
> I have a .png or .gif image (e.g. an ImageMorph) with transparent
> parts (e.g. a circle where the outer part is transparent). I now want
> to have this one image and color it programmatically with other
> colors (e.g. the circle appearing in slight red, green, blue ...).
>
> Is this possible to do with Squeak/Morphic? How?
>
> Thanks,
> Matthias
> _______________________________________________
> Beginners mailing list
> [hidden email]
> http://lists.squeakfoundation.org/mailman/listinfo/beginners

> Hi,
>
> thanks for your hints. I also found ColorForm>>replaceColor:with:  
> which
> does what you describe. But it is unfortunately not what I was looking
> for. I wasn't very clear in my original post:
>
> I (now) have a gray-scale image which I want to colorize, that is I
> want to change the hue of the image and not just replace a color with
> another (or floodfill for that matter).
>
> Hope you guys have some ideas. I tried searching with the Method  
> Finder,
> but my poor english didn't take me very far.

> On 22.11.2008, at 01:15, Matthias Korn wrote:
>
> > Hi,
> >
> > thanks for your hints. I also found ColorForm>>replaceColor:with:  
> > which
> > does what you describe. But it is unfortunately not what I was
> > looking for. I wasn't very clear in my original post:
> >
> > I (now) have a gray-scale image which I want to colorize, that is I
> > want to change the hue of the image and not just replace a color
> > with another (or floodfill for that matter).
> >
> > Hope you guys have some ideas. I tried searching with the Method  
> > Finder,
> > but my poor english didn't take me very far.
>
>
> Use a color map. Your grayscale image could be 8 bits, so with a 256  
> entries palette you can map that to any color(s) you want. Color
> maps are used in ColorForm, or directly with BitBlt.
>
> - Bert -
>
>
> _______________________________________________
> Beginners mailing list
> [hidden email]
> http://lists.squeakfoundation.org/mailman/listinfo/beginners

> Hi Bert,
>
> I have quite a hard time understanding how to use color maps. And I
> really did not find any helpful documentation on them for Squeak.
>
> One example I found in the image is in BitBlt class>>exampleColorMap.
> But I don't know how to use it with a Form/BitBlt, well, and what the
> heck they are actually doing there...
> In most occasions they used the Bitmap class instead of ColorMap and I
> couldn't find anything to convert.
>
> Could you provide a simple code example on how to modify the color
> map of a Form? Or any other pointers....
>
> Thanks a lot,
> Matthias
>
>
> Am Sat, 22 Nov 2008 01:58:33 +0100
> schrieb Bert Freudenberg <[hidden email]>:
>
>> On 22.11.2008, at 01:15, Matthias Korn wrote:
>>
>>> Hi,
>>>
>>> thanks for your hints. I also found ColorForm>>replaceColor:with:
>>> which
>>> does what you describe. But it is unfortunately not what I was
>>> looking for. I wasn't very clear in my original post:
>>>
>>> I (now) have a gray-scale image which I want to colorize, that is I
>>> want to change the hue of the image and not just replace a color
>>> with another (or floodfill for that matter).
>>>
>>> Hope you guys have some ideas. I tried searching with the Method
>>> Finder,
>>> but my poor english didn't take me very far.
>>
>>
>> Use a color map. Your grayscale image could be 8 bits, so with a 256
>> entries palette you can map that to any color(s) you want. Color
>> maps are used in ColorForm, or directly with BitBlt.
>>
>> - Bert -
>>
>>
>> _______________________________________________
>> Beginners mailing list
>> [hidden email]
>> http://lists.squeakfoundation.org/mailman/listinfo/beginners
>
>
> --
> Matthias Korn
> Institut für Wirtschaftsinformatik
> Fachbereich 5
> Universität Siegen
> Telefon: +49 (0) 271 / 23 67 660
> Mobil: +49 (0) 176 / 700 17 17 8
> Uni: +49 (0) 271/ 740 - 3382
> eMail: [hidden email]
> _______________________________________________
> Beginners mailing list
> [hidden email]
> http://lists.squeakfoundation.org/mailman/listinfo/beginners

> Off the top of my head, this should make a nice rainbow palette:
>
> anArray := (1 to: 256) collect:
> [:i | Color h: i*360/256 s: 1 v: 1].
> someColorForm colors: anArray.
>
> So basically the color map is simply an array of Colors.
>
> - Bert -
>
> On 22.11.2008, at 13:07, Matthias Korn wrote:
>
> > Hi Bert,
> >
> > I have quite a hard time understanding how to use color maps. And I
> > really did not find any helpful documentation on them for Squeak.
> >
> > One example I found in the image is in BitBlt
> > class>>exampleColorMap. But I don't know how to use it with a
> > class>>Form/BitBlt, well, and what the
> > heck they are actually doing there...
> > In most occasions they used the Bitmap class instead of ColorMap
> > and I couldn't find anything to convert.
> >
> > Could you provide a simple code example on how to modify the color
> > map of a Form? Or any other pointers....
> >
> > Thanks a lot,
> > Matthias
> >
> >
> > Am Sat, 22 Nov 2008 01:58:33 +0100
> > schrieb Bert Freudenberg <[hidden email]>:
> >
> >> On 22.11.2008, at 01:15, Matthias Korn wrote:
> >>
> >>> Hi,
> >>>
> >>> thanks for your hints. I also found ColorForm>>replaceColor:with:
> >>> which
> >>> does what you describe. But it is unfortunately not what I was
> >>> looking for. I wasn't very clear in my original post:
> >>>
> >>> I (now) have a gray-scale image which I want to colorize, that is
> >>> I want to change the hue of the image and not just replace a color
> >>> with another (or floodfill for that matter).
> >>>
> >>> Hope you guys have some ideas. I tried searching with the Method
> >>> Finder,
> >>> but my poor english didn't take me very far.
> >>
> >>
> >> Use a color map. Your grayscale image could be 8 bits, so with a
> >> 256 entries palette you can map that to any color(s) you want.
> >> Color maps are used in ColorForm, or directly with BitBlt.
> >>
> >> - Bert -