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The problem while saving a file with 256 colors.

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T O P I C R E V I E W
graph_man	Posted - Feb 01 2022 : 18:59:58 The problem while saving a TIFF file with 256 colors. The resulting file is greater than when saving 24 bits. I can send a file to Nigel.
8 L A T E S T R E P L I E S (Newest First)
graph_man	Posted - Feb 07 2022 : 04:36:52 Thank you
xequte	Posted - Feb 06 2022 : 21:18:13 Hi The image (KM num-bw.tif) contains an unused Alpha channel, so ImageEn auto-fixes your TIFF properties to ensure it is compatible. You can prevent this by removing the unused alpha channel (which we will do automatically in the next update). If ImageEnView1.IEBitmap.HasAlphaChannel(True) = False then ImageEnView1.IEBitmap.RemoveAlphaChannel(); Nigel Xequte Software www.imageen.com
graph_man	Posted - Feb 03 2022 : 04:09:24 My code is ImageEnView1.IO.LoadFromFile('d:\KM num-bw.tif'); Imageendialog - colors = 8bit - save ImageEnView1.IO.SaveToFile('d:\KM num-bw_8bit.tif');
xequte	Posted - Feb 02 2022 : 20:52:41 Hi What is your code? The following gave me expected results: ImageEnView1.IO.LoadFromFile('d:\KM num-bw.tif'); ImageEnView1.IO.Params.TIFF_Compression := ioTIFF_LZW; IEGlobalSettings().AutoSetBitDepth := true; ImageEnView1.IEBitmap.PixelFormat := ie24RGB; ImageEnView1.IO.SaveToFile('d:\KM num-bw_24bit.tif'); // 707 KB ImageEnView1.IO.LoadFromFile('d:\KM num-bw.tif'); ImageEnView1.IO.Params.TIFF_Compression := ioTIFF_LZW; IEGlobalSettings().AutoSetBitDepth := true; ImageEnView1.IEBitmap.PixelFormat := ie8g; ImageEnView1.IO.SaveToFile('d:\KM num-bw_8bit.tif'); // 325 KB ImageEnView1.IO.LoadFromFile('d:\KM num-bw.tif'); ImageEnView1.IO.Params.TIFF_Compression := ioTIFF_LZW; IEGlobalSettings().AutoSetBitDepth := true; ImageEnView1.IEBitmap.PixelFormat := ie1g; ImageEnView1.IO.SaveToFile('d:\KM num-bw_1bit.tif'); // 100 KB Nigel Xequte Software www.imageen.com
graph_man	Posted - Feb 02 2022 : 07:06:27 I sent you my file.
graph_man	Posted - Feb 02 2022 : 03:52:54 Compression is the same for all tested colors - LZW. Try saving your file in 16, 256 and 24k colors and you will see the problem.
xequte	Posted - Feb 01 2022 : 19:42:10 Hi Some compression types, like JPEG, cannot be used with 256 colors, so an alternative compression is substituted. This can make the file size larger. Nigel Xequte Software www.imageen.com
graph_man	Posted - Feb 01 2022 : 19:10:03 Although the Advanced dialog box shows a completely different file size.