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Um, since when is commercial software with a trial considered "free"? Perhaps Adobe Flash is free as well, if that's the case... Esn 01:28, 12 May 2007 (UTC)
Since there are ports to Linux and Mac OS X, shouldn't we report them in the infobox? -- Ysangkok 19:16, 17 May 2007 (UTC)
"PNGOUT also performs automatic bit depth, color and palette reduction where appropriate." Is this true? My 20050422 Linux version certainly doesn't; I always preprocess my PNGs with pngrewrite. If pngout does do this now, can you indicate when this functionality was added? Is it documented somewhere? The tutorial at http://advsys.net/ken/util/pngout.htm still says "It won't reduce the number of colors in images or convert the colors to grayscale unless all the colors correspond to PNG grayscale values already." Is it out of date? – gpvos (talk) 10:32, 28 May 2007 (UTC)
An explanation to clarify the above notes: PNGOUT will never reduce the number of actual, visible unique colors. PNGOUT never makes changes to the final form of the displayed image. What it will do, if there are 256 or fewer unique colors in the visible image, is reduce the number of palette (color) entries in the PNG file. For example, if there are only 50 unique colors in the image, the new PNG file will have only a 50-color palette with no wasted entries, instead of a 256-color palette with 206 wasted entries. In most cases where this can be done, it results in a major reduction in file size to store exactly the same image. In addition, if every "color" is just a shade of black/grey/white (i.e., red, green, and blue are exactly equal for each palette entry), PNGOUT can make the PNG a greyscale image (monochrome with only white, no color tint) instead of a color image. Note that all these changes affect only file efficiency and, as PNGOUT says, never reduce the colors or make any other changes to the visible image itself, only to how it's stored. -- Closeapple ( talk) 23:19, 19 November 2007 (UTC)
I think freeware programs like PNGGauntlet (a GUI for PNGOUT) - http://brh.numbera.com/software/pnggauntlet/ and Irfanview's PNGOUT plugin - http://www.irfanview.com/plugins.htm should also be mentioned in the article. Very useful as the only GUI for PNGOUT mentioned in this article is not freeware. —Preceding unsigned comment added by 124.217.75.211 ( talk) 08:39, 2 March 2008 (UTC)
So is it or not lossless? —Preceding unsigned comment added by 130.161.157.206 ( talk • contribs) 16:31, 27 October 2008
From my experience, PNGOUT is inefficient for relatively large images. In two senses: it works slower and, even more important, produces larger outputs than pngcrush does. Are there any [reliable] studies of this aspect to include in the article? I think, it is quite valuable information. — Preceding unsigned comment added by Mikhail Ryazanov ( talk • contribs) 03:45, 3 February 2011 (UTC)
I see many results in Google when searching for PNGOUT. Here are some reliable sources:
The authors of the above-linked articles are well-known (in the world of computing), and one has a Wikipedia page. As to PNGOUT's importance:
I may not have time to add info to the article. So feel free to incorporate the above info, citations, and more, into the article. -- Timeshifter ( talk) 05:26, 13 August 2015 (UTC)
This article was nominated for deletion on 16 July 2015. The result of the discussion was no consensus. |
This is the
talk page for discussing improvements to the
PNGOUT article. This is not a forum for general discussion of the article's subject. |
Article policies
|
Find sources: Google ( books · news · scholar · free images · WP refs) · FENS · JSTOR · TWL |
This article is rated Stub-class on Wikipedia's
content assessment scale. It is of interest to the following WikiProjects: | |||||||||||||||||||||||||||
|
Um, since when is commercial software with a trial considered "free"? Perhaps Adobe Flash is free as well, if that's the case... Esn 01:28, 12 May 2007 (UTC)
Since there are ports to Linux and Mac OS X, shouldn't we report them in the infobox? -- Ysangkok 19:16, 17 May 2007 (UTC)
"PNGOUT also performs automatic bit depth, color and palette reduction where appropriate." Is this true? My 20050422 Linux version certainly doesn't; I always preprocess my PNGs with pngrewrite. If pngout does do this now, can you indicate when this functionality was added? Is it documented somewhere? The tutorial at http://advsys.net/ken/util/pngout.htm still says "It won't reduce the number of colors in images or convert the colors to grayscale unless all the colors correspond to PNG grayscale values already." Is it out of date? – gpvos (talk) 10:32, 28 May 2007 (UTC)
An explanation to clarify the above notes: PNGOUT will never reduce the number of actual, visible unique colors. PNGOUT never makes changes to the final form of the displayed image. What it will do, if there are 256 or fewer unique colors in the visible image, is reduce the number of palette (color) entries in the PNG file. For example, if there are only 50 unique colors in the image, the new PNG file will have only a 50-color palette with no wasted entries, instead of a 256-color palette with 206 wasted entries. In most cases where this can be done, it results in a major reduction in file size to store exactly the same image. In addition, if every "color" is just a shade of black/grey/white (i.e., red, green, and blue are exactly equal for each palette entry), PNGOUT can make the PNG a greyscale image (monochrome with only white, no color tint) instead of a color image. Note that all these changes affect only file efficiency and, as PNGOUT says, never reduce the colors or make any other changes to the visible image itself, only to how it's stored. -- Closeapple ( talk) 23:19, 19 November 2007 (UTC)
I think freeware programs like PNGGauntlet (a GUI for PNGOUT) - http://brh.numbera.com/software/pnggauntlet/ and Irfanview's PNGOUT plugin - http://www.irfanview.com/plugins.htm should also be mentioned in the article. Very useful as the only GUI for PNGOUT mentioned in this article is not freeware. —Preceding unsigned comment added by 124.217.75.211 ( talk) 08:39, 2 March 2008 (UTC)
So is it or not lossless? —Preceding unsigned comment added by 130.161.157.206 ( talk • contribs) 16:31, 27 October 2008
From my experience, PNGOUT is inefficient for relatively large images. In two senses: it works slower and, even more important, produces larger outputs than pngcrush does. Are there any [reliable] studies of this aspect to include in the article? I think, it is quite valuable information. — Preceding unsigned comment added by Mikhail Ryazanov ( talk • contribs) 03:45, 3 February 2011 (UTC)
I see many results in Google when searching for PNGOUT. Here are some reliable sources:
The authors of the above-linked articles are well-known (in the world of computing), and one has a Wikipedia page. As to PNGOUT's importance:
I may not have time to add info to the article. So feel free to incorporate the above info, citations, and more, into the article. -- Timeshifter ( talk) 05:26, 13 August 2015 (UTC)