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Hi:
Certainly I do not know much about colours, rgb, hcl et all and I can't understand how is that in Cuis the values of rgb (or hcl) admit float values (0.0 to 1.0) and in any web conversion utility only integers are accepted. Any explanation will be appreciated. _______________________________________________ Cuis mailing list [hidden email] http://jvuletich.org/mailman/listinfo/cuis_jvuletich.org |
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On 13 August 2013 15:41, Germán Arduino <[hidden email]> wrote:
> Hi: > > Certainly I do not know much about colours, rgb, hcl et all and I can't > understand how is that in Cuis the values of rgb (or hcl) admit float values > (0.0 to 1.0) and in any web conversion utility only integers are accepted. > > Any explanation will be appreciated. Unless Cuis's Color has radically drifted from Squeak's Color, you can consider the float range to be a remapping of the integer range 0..255, indicating the amount of that colour. So primary red, #ff0000, is Color r: 1.0 g: 0.0 b: 0.0. In other words, 1.0 means "as much red as possible" and 0.0 means "no red at all" while 0.5 means "half the possible amount of red". On the other hand, Color r: 0.5 g: 0.5 b: 0.5 is #7f7f7f because (0.5 * 255) asInteger printStringHex = '7F'. (I might well be committing an off-by-one error in the above, because I vaguely recall Juan talking about this a few months ago). frank _______________________________________________ Cuis mailing list [hidden email] http://jvuletich.org/mailman/listinfo/cuis_jvuletich.org |
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I see 0..255 range as an humankind history accident
Float range from 0.0 to 1.0 are forever, or at least, while we have a color expressed as red, green, blue Program for the Enterprise (Star Trek) software
On Tue, Aug 13, 2013 at 2:25 PM, Frank Shearar <[hidden email]> wrote:
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In reply to this post by Frank Shearar-3
ok, clear enough, thanks Frank and Angel. Seems that then I can't test a color used in Cuis with most of online tools....but now I'm checking the examples in Color class in Cuis to try inside Cuis.
Thanks! 2013/8/13 Frank Shearar <[hidden email]>
Saludos / Regards,
Germán Arduino www.arduinosoftware.com _______________________________________________ Cuis mailing list [hidden email] http://jvuletich.org/mailman/listinfo/cuis_jvuletich.org |
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On 13/08/2013 19:26, Germán Arduino
wrote:
One other thing I haven't seen mentioned is that float colours will continue to work completely correctly if Cuis gains the ability to handle 16 bit per channel images. Or any other types of RGB images for that matter. e.g. Scans and digital camera raw formats can have some really odd bit depths. _______________________________________________ Cuis mailing list [hidden email] http://jvuletich.org/mailman/listinfo/cuis_jvuletich.org |
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In reply to this post by garduino
Is there an #asHTMLColor selector?
On 13 August 2013 19:26, Germán Arduino <[hidden email]> wrote: > ok, clear enough, thanks Frank and Angel. > > Seems that then I can't test a color used in Cuis with most of online > tools....but now I'm checking the examples in Color class in Cuis to try > inside Cuis. > > Thanks! > > > 2013/8/13 Frank Shearar <[hidden email]> >> >> On 13 August 2013 15:41, Germán Arduino <[hidden email]> wrote: >> > Hi: >> > >> > Certainly I do not know much about colours, rgb, hcl et all and I can't >> > understand how is that in Cuis the values of rgb (or hcl) admit float >> > values >> > (0.0 to 1.0) and in any web conversion utility only integers are >> > accepted. >> > >> > Any explanation will be appreciated. >> >> Unless Cuis's Color has radically drifted from Squeak's Color, you can >> consider the float range to be a remapping of the integer range >> 0..255, indicating the amount of that colour. So primary red, #ff0000, >> is Color r: 1.0 g: 0.0 b: 0.0. In other words, 1.0 means "as much red >> as possible" and 0.0 means "no red at all" while 0.5 means "half the >> possible amount of red". >> >> On the other hand, Color r: 0.5 g: 0.5 b: 0.5 is #7f7f7f because (0.5 >> * 255) asInteger printStringHex = '7F'. >> >> (I might well be committing an off-by-one error in the above, because >> I vaguely recall Juan talking about this a few months ago). >> >> frank >> >> _______________________________________________ >> Cuis mailing list >> [hidden email] >> http://jvuletich.org/mailman/listinfo/cuis_jvuletich.org > > > > > -- > Saludos / Regards, > Germán Arduino > www.arduinosoftware.com > > _______________________________________________ > Cuis mailing list > [hidden email] > http://jvuletich.org/mailman/listinfo/cuis_jvuletich.org > _______________________________________________ Cuis mailing list [hidden email] http://jvuletich.org/mailman/listinfo/cuis_jvuletich.org |
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Not sure. Maybe look at #pixelValueForDepth: ? I could actually see some use for something like #rInt:gInt:bInt:aInt (mostly for dealing with the marketing or ad sales teams. OTOH, these are the same people who once asked us to move the logo over to the left four and a third pixels, so who knows *shrug.*)
On Tue, Aug 13, 2013 at 12:01 PM, Frank Shearar <[hidden email]> wrote: Is there an #asHTMLColor selector? Casey Ransberger _______________________________________________ Cuis mailing list [hidden email] http://jvuletich.org/mailman/listinfo/cuis_jvuletich.org |
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On Tue, 13 Aug 2013 13:05:03 -0700
Casey Ransberger <[hidden email]> wrote: > Not sure. Maybe look at #pixelValueForDepth: ? > > I could actually see some use for something like #rInt:gInt:bInt:aInt > (mostly for dealing with the marketing or ad sales teams. OTOH, these are > the same people who once asked us to move the logo over to the left four > and a third pixels, so who knows *shrug.*) Useful to look at Color Class>>fromString: Note lines like: red := ('16r', (aColorHexU copyFrom: 2 to: 3)) asNumber/255. So: (((Color fromString: '#5edc1f') red) * 255) truncated hex. ==> '16r5E' Likewise for #green and #blue. So now you can write a Color instance method that returns the hex R G and B values in 0..255, yes? Cheers, Ken [dot] Dickey [at] whidbey [dot] com _______________________________________________ Cuis mailing list [hidden email] http://jvuletich.org/mailman/listinfo/cuis_jvuletich.org
-KenD
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In reply to this post by garduino
Hi Germán,
I hope the help folks already gave was useful. In any case, what do you mean by 'testing a Cuis color with an online tool'? Don't hesitate to keep asking :) Cheers, Juan Vuletich On 8/13/2013 3:26 PM, Germán Arduino wrote:
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2013/8/13 Juan Vuletich <[hidden email]>
Yes, Indeed!
I meant, for example, use a tool as this one http://html-color-codes.info/codigos-de-colores-hexadecimales/ [*] to quickly test rgb and hcl, BUT antismalltalker me!! I can do it easily in Cuis :)
[*] Here you can use only integers. Cheers! _______________________________________________ Cuis mailing list [hidden email] http://jvuletich.org/mailman/listinfo/cuis_jvuletich.org |
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By the way, you might be interested in named colors.
You can get the closest named color to an arbitrary color. The CSS3 color names are useful in Web work. Feature require: 'CSS3-NamedColors'. Color setColorNamesDict: (Color css3ColorDictionary). (Color fromString: '#5edc1f') closestColorName. "--> #lawnGreen" Cheers! -- Ken [dot] Dickey [at] whidbey [dot] com _______________________________________________ Cuis mailing list [hidden email] http://jvuletich.org/mailman/listinfo/cuis_jvuletich.org
-KenD
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ahhh yes! Thanks Ken! 2013/8/15 Ken Dickey <[hidden email]> By the way, you might be interested in named colors. Saludos / Regards,
Germán Arduino www.arduinosoftware.com _______________________________________________ Cuis mailing list [hidden email] http://jvuletich.org/mailman/listinfo/cuis_jvuletich.org |
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