Hi Wilhelm, Yes, I do remember your generous attributions and thank you for them-- but your work went well beyond anything I had done and it has been a great contribution to our community. Much thanks for that!
Also, thank-you for your fine assessment of the issue and when I have time, I will try and implement exactly that. When done, I'll be sure and post an example here as well as returning the compliment! On Fri, Jul 8, 2011 at 5:24 PM, Wilhelm Sanke <sa...@hrz.uni-kassel.de>wrote: > On Fri Jul 8, 2011, Jim Ault jimaultwins at yahoo.com wrote: > > > On Jul 7, 2011, at 11:08 PM, Chipp Walters wrote: >> >> > Hey guys, I'm building another education app for a state school >> > system, and >> > this time I'm creating a skinnable themed desktop, which kids can >> > add their >> > own wallpaper to. I'm wondering if anyone has a quick routine to >> > calculate >> > the 'main' colors of an image-- so I could automatically theme the >> > button >> > colors and some other objects. >> > >> > If not, I'll have to write my own. Thx. >> > >> >> >> You could take a look at Wilhem Sanke's ImageData Toolkit at >> >> http://www.sanke.org/**MetaMedia/Samples.htm<http://www.sanke.org/MetaMedia/Samples.htm> >> >> and here is a blast from the past you might appreciate Chipp >> >> http://runtime-revolution.**278305.n4.nabble.com/ANN-quot-** >> Imagedata-Toolkit-2-quot-**released-td349536.html<http://runtime-revolution.278305.n4.nabble.com/ANN-quot-Imagedata-Toolkit-2-quot-released-td349536.html> >> >> Hope this helps. >> >> Jim Ault >> Las Vegas >> > > and > Chipp Walters chipp at chipp.com answered: > > > > Thanks Jim. That is a blast from the past. In fact, I'm pretty sure I >> wrote >> the first convolve matrix which Wilhelm used for his earlier work. I wrote >> it to create blurred shadows for ButtonGaget and to help with some image >> compositing. >> >> I suspect I'll have to write my own imagedata parser and do the necessary >> math. It takes time... ;-( >> > > > Hello Chipp, > > You know that I have mentioned you as the author of the first convolve > matrix fully scripted in Metacard/Revolution time and again at various > places. For example, I refer to you in the script of button "scripted > version" in my stack "Imagedata Toolkit Preview 3" <http://www.sanke.org/* > *Software/**ImagedataToolkitPreview3.zip<http://www.sanke.org/Software/ImagedataToolkitPreview3.zip>>, > and - as another example - I have given a detailed description of the > transition steps from your original script to a speed-optimized version I > use today (to which Mark Waddingham also contributed) even a few weeks ago > in my post <""Blurred vision" of Rev Newsletter, Apr 21"> to this list on > April 26, 2011. > > Concerning your question how to > > > "calculate the 'main' colors of an image-- so I could automatically theme > the button colors and some other objects" > > with the help of a histogram > > I am not exactly sure what you intend to do, Are you looking for one or > several "main colors" of an image to use with your buttons and other > objects? And how to you intend to proceed from the various possible > representations of a color histogram (for each of the RGB values, for the > gray or even the hue values in HSV) to get one or several "main colors"? > > A general recipe to create histograms can be found in Wikipedia under items > > "image histogram" and "color histogram". Maybe you could also use the free > "Gimp" program and use the histogram data of an image from there? > > To write your own histogram tool should be relatively easy in principle: > > - Get the RGB values of each pixel of an image (or a selected area of an > image). > - count the number of occurences for each color of the RGB triple and for > each value 0 to 255 > - show the accumulated numbers for each value category 0 to 255 in a chart. > > Thus you can get separate histograms for each of the three RGB colors or > one for the gray values when you average the RGB values before. > > To find one single "main" color of an image, you could sum up all values > for the three components R, G, and B separately and calculate the average > for each component. > > Another approach would be to get the "hue" values of the image pixels using > Scott Raney's RGBtoHSV function to be found in the Metacard "Color Chooser" > and Livecode's "revcolorchooser" stacks (the latter of which is no longer > actively used in the Livecode IDE, but has remained in the "Toolset" > folder). > Raney's function unfortunately is very slow when it comes to calculate all > pixels of a medium-sized image, I prefer faster RGBtoHSL and HSLtoRGB > functions that I have ported to Livecode from examples found in the net. > > I have so far not had a reason to use color histograms in my different > image-processing stacks, but experimented with a number of other routines to > set general parameters of images like "white balance", "mid balance", "black > balance", "gamma correction", "dynamic range", "saturation", "set chroma", > "brighten/darken", "contrast", "shift hues" etc. etc.- > > I take it that most of the things I mentioned in this context here are > certainly not new to you, but if you could be a bit more specific about what > you intend to achieve I could possibly also come up with an idea or two. > > Best regards, > > Wilhelm Sanke > > > > > ______________________________**_________________ > use-livecode mailing list > use-livecode@lists.runrev.com > Please visit this url to subscribe, unsubscribe and manage your > subscription preferences: > http://lists.runrev.com/**mailman/listinfo/use-livecode<http://lists.runrev.com/mailman/listinfo/use-livecode> > -- Chipp Walters CEO, Shafer Walters Group, Inc. _______________________________________________ use-livecode mailing list use-livecode@lists.runrev.com Please visit this url to subscribe, unsubscribe and manage your subscription preferences: http://lists.runrev.com/mailman/listinfo/use-livecode