[Gimp-user] Banding in gradient creation
Hi Miles. I'm afraid the technical details of bit-depths and monitor hardware are beyond me. However, when playing with inkscape I can create gradients that don't have bands. Also, when I'm viewing other peoples artwork online I don't get the bands. I'm guessing that this might mean that the problem might not be my monitor, but is more likely to be the technique that I'm using in gimp. Could this be the case? -- bob (via www.gimpusers.com) ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: [Gimp-user] Banding in gradient creation
You might want to check the color depth of your document. If it's indexed color then the document may not be able to create smooth gradients because their aren't enough colors in the pallet. You can tell if this is the problem (on 2.6.8) by going through the menus to image-mode-... If image-mode-indexed is selected then the document is indexed color, and you should change it to image-mode-RGB. On 08/25/2010 02:35 AM, bob wrote: Hi Miles. I'm afraid the technical details of bit-depths and monitor hardware are beyond me. However, when playing with inkscape I can create gradients that don't have bands. Also, when I'm viewing other peoples artwork online I don't get the bands. I'm guessing that this might mean that the problem might not be my monitor, but is more likely to be the technique that I'm using in gimp. Could this be the case? ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: [Gimp-user] Banding in gradient creation
GSR - FR fam...@infernal-iceberg.com writes: Also, are you sure your monitor is not the one giving you some extra banding? Some are sold as 24 bit color, but are 18 plus tricks. Probably _most_ monitors sold these days are 18 plus tricks (though the tricks these days seem to be a lot better than in the past), with dodgy wording in the specs used to hide that fact from all but the most determined buyers. -Miles -- The automobile has not merely taken over the street, it has dissolved the living tissue of the city. Its appetite for space is absolutely insatiable; moving and parked, it devours urban land, leaving the buildings as mere islands of habitable space in a sea of dangerous and ugly traffic. [James Marston Fitch, New York Times, 1 May 1960] ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
[Gimp-user] Banding in gradient creation
I think your problem may be more to do with your computer display settings. Mines is on 32 bit - and I get no banding at all. -- Bill (via www.gimpusers.com) ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
[Gimp-user] Banding in gradient creation
Hey guys. I created an A4 sized canvas and made a black background layer. On a new layer I wanted to create a large lighting effect that would use most of the area of the canvas: new transparent layer - select fg to transparent radial gradient... But I got banding. I selected dithering, and still got banding. I used a large, circular self-created circular fuzzy lighting brush, and tried to create the same target effect. Still got banding. What's the solution to this? -- bobdobbs (via www.gimpusers.com) ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: [Gimp-user] Banding in gradient creation
bobdobbs for...@gimpusers.com wrote: Hey guys. I created an A4 sized canvas and made a black background layer. On a new layer I wanted to create a large lighting effect that would use most of the area of the canvas: new transparent layer - select fg to transparent radial gradient... But I got banding. I selected dithering, and still got banding. I used a large, circular self-created circular fuzzy lighting brush, and tried to create the same target effect. Still got banding. What's the solution to this? Is your image in indexed or RGB mode? Is your gradient monochrome? What is its size? Say you draw a monochrome gradient from back to white along 2560 pixels. You only have 256 different colors, thus you get bands 10 pixels wide. And dithering does not have a real effect in such a case. -- Olivier Lecarme ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
[Gimp-user] Banding in gradient creation
Say you draw a monochrome gradient from back to white along 2560 pixels. You only have 256 different colors, thus you get bands 10 pixels wide. And dithering does not have a real effect in such a case. I'm in RGB mode. The image is 2480px wide and 2794px high. Is there a way that I can create a smooth gradient? Will switching to another colour mode help? How can I work this out for myself in the future? -- bob (via www.gimpusers.com) ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: [Gimp-user] Banding in gradient creation
bob for...@gimpusers.com wrote: Say you draw a monochrome gradient from black to white along 2560 pixels. You only have 256 different colors, thus you get bands 10 pixels wide. And dithering does not have a real effect in such a case. I'm in RGB mode. The image is 2480px wide and 2794px high. I tried the same size with a gradient from black to white, and another from red to green. In my opinion, the banding effect is not really obvious, but maybe my sight is not as sharp as yours. Anyway, it is still less obvious in the polychrome gradient. Is there a way that I can create a smooth gradient? Will switching to another colour mode help? No, it would be worse. How can I work this out for myself in the future? The only possible improvement would be to have 16-bit depth colors. You'll have to wait for GIMP 3.0... -- Olivier Lecarme ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: [Gimp-user] Banding in gradient creation
Hi, for...@gimpusers.com (2010-07-28 at 0914.52 +0200): Say you draw a monochrome gradient from back to white along 2560 pixels. You only have 256 different colors, thus you get bands 10 pixels wide. And dithering does not have a real effect in such a case. I'm in RGB mode. The image is 2480px wide and 2794px high. Really big image... if dithering is not helping, and some passes of Spread filter are not hidding the problem, not much you can do currently. Also, are you sure your monitor is not the one giving you some extra banding? Some are sold as 24 bit color, but are 18 plus tricks. Is there a way that I can create a smooth gradient? Higher bit depth, which is not possible in GIMP for now. GSR ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: [Gimp-user] Banding in gradient creation
On Wed, Oct 21, 2009 at 5:16 PM, bob for...@gimpusers.com wrote: Hi guys. I often get bands when I create gradients. I'd like to know how this happends and how I can reduce or get rid of these artifacts entirely. Are you sure it's not your monitor? I have a Dell LCD monitor that has this problem really badly... but on a different model it looks fine, no banding. ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
Re: [Gimp-user] Banding in gradient creation
Eek, I send this to Paul H. only instead of the list, resending. Apologies for the noise Paul. I often get bands when I create gradients. I'd like to know how this happends and how I can reduce or get rid of these artifacts entirely. Are you sure it's not your monitor? I have a Dell LCD monitor that has this problem really badly... but on a different model it looks fine, no banding. You can try to use the Dithering option (and maybe the Adaptive Supersampling option too) of the Gradient/Blend tool, if you don't already. See http://docs.gimp.org/en/gimp-tool-blend.html#id2858083 - the bottom option of the dialog In general without dithering the gradients show banding. -- Aurore ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
[Gimp-user] Banding in gradient creation
Hi guys. I often get bands when I create gradients. I'd like to know how this happends and how I can reduce or get rid of these artifacts entirely. Thanks. -- bob (via www.gimpusers.com) ___ Gimp-user mailing list Gimp-user@lists.XCF.Berkeley.EDU https://lists.XCF.Berkeley.EDU/mailman/listinfo/gimp-user
