Difference between revisions of "PNG"
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== Saving png out of Photoshop == | == Saving png out of Photoshop == | ||
| − | [http://www.hash.com/forums/index.php?s=&showtopic=40012&view=findpost&p=350913 | + | [http://www.hash.com/forums/index.php?s=&showtopic=40012&view=findpost&p=350913 Source]: Yves Poissant addressed problems saving PNG from Photoshop a couple of years ago. It seems Photoshop (and perhaps other programs) sets the gamma of png images in some strange way. I think on Windows, the gamma is set to 2.2. Yves suggested removing the gamma information altogether using a program like PngCrush ( http://pmt.sourceforge.net/pngcrush/ ). |
You can also use IrfanView to gamma correct a png image. Open the image in IrfanView and go to Image > Color Corrections. Then set "Gamma Correction" to 1.00. | You can also use IrfanView to gamma correct a png image. Open the image in IrfanView and go to Image > Color Corrections. Then set "Gamma Correction" to 1.00. | ||
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You can also Batch correct a bunch of png images at once. Open IrfanView and go to Fle > batch Conversion. For "Output Format", choose "png". Then hit the "Advanced" button. Then check the box for "Gamma Correction" and enter a value. | You can also Batch correct a bunch of png images at once. Open IrfanView and go to Fle > batch Conversion. For "Output Format", choose "png". Then hit the "Advanced" button. Then check the box for "Gamma Correction" and enter a value. | ||
http://www.irfanview.com/ | http://www.irfanview.com/ | ||
| − | The problem is more widespread in the web browser arena. Here is a brief overview of the problem web browsers have with correctly rendering png images. http://morris-photographics.com/photoshop/ | + | The problem is more widespread in the web browser arena. Here is a brief overview of the problem web browsers have with correctly rendering png images. http://morris-photographics.com/photoshop/articles/png-gamma.html |
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Revision as of 16:02, 21 May 2011
Problems with PNG
Saving png out of Photoshop
Source: Yves Poissant addressed problems saving PNG from Photoshop a couple of years ago. It seems Photoshop (and perhaps other programs) sets the gamma of png images in some strange way. I think on Windows, the gamma is set to 2.2. Yves suggested removing the gamma information altogether using a program like PngCrush ( http://pmt.sourceforge.net/pngcrush/ ).
You can also use IrfanView to gamma correct a png image. Open the image in IrfanView and go to Image > Color Corrections. Then set "Gamma Correction" to 1.00.
You can also Batch correct a bunch of png images at once. Open IrfanView and go to Fle > batch Conversion. For "Output Format", choose "png". Then hit the "Advanced" button. Then check the box for "Gamma Correction" and enter a value. http://www.irfanview.com/
The problem is more widespread in the web browser arena. Here is a brief overview of the problem web browsers have with correctly rendering png images. http://morris-photographics.com/photoshop/articles/png-gamma.html
