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editing_tutorial [2013/05/01 00:09]
phyis 1600 -> 2000
editing_tutorial [2013/05/07 14:20]
procyon [6. Resizing and Exporting] This theory probably isn't true anyway.
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 ===== 6. Resizing and Exporting ===== ===== 6. Resizing and Exporting =====
-<​spoiler|PNG-8 ​17 colours>​{{ :​save_for_web.png?​nolink |}}</​spoiler>​+<​spoiler|PNG-8 ​32 colours>​{{ :​save_for_web.png?​nolink |}}</​spoiler>​
 These settings are recommended for editors who use only Photoshop to export images and no other program for post-optimization:​ These settings are recommended for editors who use only Photoshop to export images and no other program for post-optimization:​
 __File → Save for Web → choose “PNG-8”,​ “Adaptive”,​ “Diffusion”,​ type in 32 for “Colors”,​ “Dithers” 100%, uncheck "​Transparency"​ → "Image Size" type in 2000 for Height ((don'​t enter anything for Width)), "​Quality"​ Bicubic → click Save.__((If you're recording this action, do not change the file name, otherwise all of your saved files later on will be changed to this name.)) __File → Save for Web → choose “PNG-8”,​ “Adaptive”,​ “Diffusion”,​ type in 32 for “Colors”,​ “Dithers” 100%, uncheck "​Transparency"​ → "Image Size" type in 2000 for Height ((don'​t enter anything for Width)), "​Quality"​ Bicubic → click Save.__((If you're recording this action, do not change the file name, otherwise all of your saved files later on will be changed to this name.))
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 ImageMagick offers an alternative color reduction method which may be more efficient. In Photoshop, export 256-colour PNG-8 images from your psd files and use this [[http://​pastebin.com/​raw.php?​i=WyUmJfvQ|Windows Batch script]] (save as .bat) by dragging & dropping the PNG files on top of it. It will change the 256-colour 8-bit files to 16-colour 4-bit files (with mogrify.exe). ImageMagick offers an alternative color reduction method which may be more efficient. In Photoshop, export 256-colour PNG-8 images from your psd files and use this [[http://​pastebin.com/​raw.php?​i=WyUmJfvQ|Windows Batch script]] (save as .bat) by dragging & dropping the PNG files on top of it. It will change the 256-colour 8-bit files to 16-colour 4-bit files (with mogrify.exe).
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-For comparing colour reduction algorithms you can use this [[http://​pastebin.com/​raw.php?​i=8gVeKrC4|Python 2.7 script]] (save as .py) to print differences between neighboring colours. Drag & drop PNG files on top of it to display the information in one column per file. The amount of colours, and the values of BL(ack) and WH(ite) are printed as well. Small differences between two colours (shown as low numbers) indicate inefficiency in the colour reduction algorithm, for it means the algorithm used two colours that are indistinguishable from each other. This leads to an image having virtually fewer colours than you intended. The average difference between two colors in a 16-colour palette is 256/15 = 17. 
editing_tutorial.txt · Last modified: 2018/05/22 17:15 (external edit)