Re: Re: Color depth - Wikipedia, the free

*To*: mathgroup at smc.vnet.net*Subject*: [mg105279] Re: [mg105231] Re: [mg105150] Color depth - Wikipedia, the free*From*: DrMajorBob <btreat1 at austin.rr.com>*Date*: Wed, 25 Nov 2009 23:02:49 -0500 (EST)*References*: <200911221111.GAA10588@smc.vnet.net>*Reply-to*: drmajorbob at yahoo.com

That definitely answers the question, I'd say. And you're right, my apologies... I stopped reading too soon, or stopped paying attention. (Sometimes it's "Short Attention-Span Theater", here.) Bobby On Wed, 25 Nov 2009 17:42:21 -0600, Patrick Scheibe <pscheibe at trm.uni-leipzig.de> wrote: > Hi, > > why do you quote just this sentence and not the one where I said that > it's not clear what exactly this means? > But to make it clear: on my system > > img = With[{n = 16^2}, > ArrayFlatten[ > Partition[ > Table[{x, y, z}, {z, 0, 1, 1/(n - 1)}, {y, 0, 1, 1/(n - 1)}, {x, > 0, 1, 1/(n - 1)}], Sqrt[n]]]] // Image[#, "Real"] &; > Export["~/tmp/24bit.bmp", img, "ColorDepth" -> 24] > > results in an image which really has 256^3 different colors and *no*, I > could not see the difference between adjacent pixels since my eyes are > too bad. But Gimp told me that every pixel is different and > > img2 = Import["~/tmp/24bit.bmp"]; > Union@Flatten[img2[[1]], 1] // Dimensions > > {16777216, 3} > > looks promising too. > I hope this was what Roger wanted to know. > > Cheers > Patrick > > > On Wed, 2009-11-25 at 16:53 -0600, DrMajorBob wrote: >> > every pixel has different rgb-values. This means if you put n=16^2 you >> > would have 256x256x256 colors... >> >> No... it means you'd have RGBColor with 256x256x256 distinct parameter >> triplets. That doesn't prove they're all distinct, implemented COLORS. >> >> We could set n=1024^2 just as easily, but is there an implemented color >> model (in Mathematica) with the required depth? >> >> Bobby >> >> On Wed, 25 Nov 2009 01:31:41 -0600, Patrick Scheibe >> <pscheibe at trm.uni-leipzig.de> wrote: >> >> > Hi, >> > >> > assume the following graphic in Mathematica >> > >> > With[{n = 4^2}, >> > ArrayFlatten[ >> > Partition[ >> > Table[{x, y, z}, {z, 0, 1, 1/(n - 1)}, {y, 0, 1, 1/(n - 1)}, {x, >> > 0, 1, 1/(n - 1)}], Sqrt[n]]]] // >> > ArrayPlot[#, ColorFunction -> RGBColor] & >> > >> > when you check the values for the colors in this image you'll see that >> > every pixel has different rgb-values. This means if you put n=16^2 you >> > would have 256x256x256 colors in the image which is exactly what >> > "millions of colors" is supposed to be. >> > Since the table creates rational expressions for the {r,g,b} colors >> you >> > could easily (with the restriction that an image of that size would >> take >> > too long to render in Mathematica) create more colors by setting >> higher >> > values to n. >> > >> > But what does this mean? Are there really that many visible colors on >> > your screen? What happens if you export the image? >> > This depends many things, e.g. on your os-settings. >> > >> > So if you really want to know more, you have to tell more about what >> you >> > try to achieve and which things are not working for you. >> > >> > Cheers >> > Patrick >> > >> > >> > >> > >> > >> > On Sun, 2009-11-22 at 06:11 -0500, Roger Bagula wrote: >> >> http://en.wikipedia.org/wiki/Color_depth >> >> >> >> Does anyone know how to access thousand and millions of >> >> colors in Mathematica? >> >> >> >> Respectfully, Roger L. Bagula >> >> 11759 Waterhill Road, Lakeside,Ca 92040-2905,tel: 619-5610814 : >> >> http://www.google.com/profiles/Roger.Bagula >> >> alternative email: roger.bagula at gmail.com >> >> >> >> >> >> >> > >> > >> >> > -- DrMajorBob at yahoo.com

**References**:**Color depth - Wikipedia, the free encyclopedia***From:*Roger Bagula <rlbagula@sbcglobal.net>

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**Re: Re: Color depth - Wikipedia, the free**

**Re: Color depth - Wikipedia, the free encyclopedia**