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Re: JPEG old compression setting offset value Started by wilxom at 02-06-2008 6:42. Topic has 3 replies. LEAD Support Fo... » Developer » Image Compressi... » Re: JPEG old compression setting offset value

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02-06-2008, 6:42 wilxom Joined on 01-09-2008 Posts 15 JPEG old compression setting offset value Hi, I am using LeadTools 14.5 V COM-VB. I have a scenario that need to be achieved but i do not know whether LeadTools app might help me. Below are the Tag No, name and value: 273 - > StripOffsets - > 935 279 - > StripByteCounts - > 47617 512 - > JpegProc - > 1 513 - > JpegIFOffset - > 588 514 - > JpegIFByteCount - > 47964 515 - > JpegRestartInterval - > 0 519 - > JpegQTables - > 310 520 - > JpegDCTables - > 378 521 - > JpegACTables - > 410 Required: 1. JpegIFOffset(513) should have identical value to StripOffsets(273) which is "935". 2. JpegIFByteCount(514) should have identical value to StripByteCount(279) which is "47617". 3. JpegRestartInterval(515) value should be "99". 4. JpegQTables(519) should be identical to "StripOffSets(273) + 25". 5. JpegDCTables(520) should be identical to "StripOffSets(273) + 107". 6. JpegACTables(521) should be identical to "StripOffSets(273) + 140". Is this Old JPEG tags value can be changed? and will it caused any instability towards the image after any changs? Please assist. Thanks. Regards, Wilson    Report

02-06-2008, 10:18 Adnan Ismail Joined on 07-31-2006 Posts 1,124 Re: JPEG old compression setting offset value Wilson, You should not modify the JPEG tags values yourself, but only let our JPEG compressor and TIFF file writer manipulate them. However, we have a flag for old JPEG, but I don't know if it will do all the changes you need or not. To try it, set the LEADRasterIO.SaveOldJTIF property to True before saving the file. Adnan Ismail LEADTOOLS Technical Support    Report

02-07-2008, 3:45 wilxom Joined on 01-09-2008 Posts 15 Re: JPEG old compression setting offset value Hi Adnan, The tags value in the previous message was generated by LeadTools OLDJPEG compression via sampel code writen below: RasterIO.SaveOldJTIF = True RasterIO.Save rasterImage, strDir & strName, FILE_TIF_JPEG, 8, 10, SAVE_OVERWRITE Is there any possibility that LeadTools able to manipulate the tags value via It's "JPEG compressor and TIFF file writer" towards the Images with the specific value that i mentioned in the previous mail? Thanks. Regards, Wilson    Report

02-07-2008, 11:34 Adnan Ismail Joined on 07-31-2006 Posts 1,124 Re: JPEG old compression setting offset value Wilson, No there are no options in the compressor to manipulate these values, and if you modified the values yourself you will corrupt the file. Adnan Ismail LEADTOOLS Technical Support    Report

LEAD Support Fo... » Developer » Image Compressi... » Re: JPEG old compression setting offset value

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