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#1
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Newbie: file size after editing .
I notice this with the files I work on. After saving, the file gets
much bigger, although it has the same format. So I opened a .jpg file of 677k size, did nothing to it and immediately "save as" in . jpg with a different name. My Photoimpact 7 opened a dialog box and I chose 100% quality so I should have no loss. The new file is now 1.7M in size but with the same image( in fact there seemed to be some slight change in the quality) why is this? how can I get a file of the same size and quality ? Is it just Photoimpact?? TIA ABC Do not reply by email. ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 100,000 Newsgroups ---= East/West-Coast Server Farms - Total Privacy via Encryption =--- |
#2
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ABC wrote:
So I opened a .jpg file of 677k size, did nothing to it and immediately "save as" in . jpg with a different name. My Photoimpact 7 opened a dialog box and I chose 100% quality so I should have no loss. It is still lossy. http://www.faqs.org/faqs/jpeg-faq/part1/section-13.html The new file is now 1.7M in size but with the same image( in fact there seemed to be some slight change in the quality) You lost a little quality by saving it as a JPEG again. http://www.faqs.org/faqs/jpeg-faq/part1/section-10.html why is this? how can I get a file of the same size and quality ? You can get the same file size by choosing a quality setting that is about the same as the one your camera uses. As for quality, the you have to select another format that JPEG. Is it just Photoimpact?? No, it's all programs that saves as JPEG (except for special programs that uses lossless conversion for rotation, mirror and crop). |
#3
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ABC wrote:
So I opened a .jpg file of 677k size, did nothing to it and immediately "save as" in . jpg with a different name. My Photoimpact 7 opened a dialog box and I chose 100% quality so I should have no loss. It is still lossy. http://www.faqs.org/faqs/jpeg-faq/part1/section-13.html The new file is now 1.7M in size but with the same image( in fact there seemed to be some slight change in the quality) You lost a little quality by saving it as a JPEG again. http://www.faqs.org/faqs/jpeg-faq/part1/section-10.html why is this? how can I get a file of the same size and quality ? You can get the same file size by choosing a quality setting that is about the same as the one your camera uses. As for quality, the you have to select another format that JPEG. Is it just Photoimpact?? No, it's all programs that saves as JPEG (except for special programs that uses lossless conversion for rotation, mirror and crop). |
#4
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Toke Eskildsen wrote:
ABC wrote: So I opened a .jpg file of 677k size, did nothing to it and immediately "save as" in . jpg with a different name. My Photoimpact 7 opened a dialog box and I chose 100% quality so I should have no loss. It is still lossy. Is it just Photoimpact?? No, it's all programs that saves as JPEG (except for special programs that uses lossless conversion for rotation, mirror and crop). On a Macintosh at least, using Save As in all programs I have tried, allows one to rename and change the directory in which the jpeg is stored. It does not change a pixel. There is no loss in that scenario. Moreover, the amount of loss is usually tiny after rediting, but can be avoided easily by saving in the native format of PS, Elements, or PSP. -- John McWilliams |
#5
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ABC wrote:
I notice this with the files I work on. After saving, the file gets much bigger, although it has the same format. So I opened a .jpg file of 677k size, did nothing to it and immediately "save as" in . jpg with a different name. My Photoimpact 7 opened a dialog box and I chose 100% quality so I should have no loss. The new file is now 1.7M in size but with the same image( in fact there seemed to be some slight change in the quality) why is this? how can I get a file of the same size and quality ? Is it just Photoimpact?? JPEG compresses images in a way which means some data is lost - the amount of data loss is varied by the quality setting. If you chose no compression then it will be maximum size. What has happened in your situation is that you've opened a 667k file, which decompresses to about 2MB. When you then save the image again you have to re-compress the image again to get it back to 667k - which would require further loss of image data to get it back to that size. If you chose no compression (or actually, no data loss compression) then you end up with a 1.7MB file. This is exactly why people use RAW/lossless image formats, and only save as JPEG when outputting the final image. Each saving of a jpeg will lose more and more data (unless no loss is specified, in which case, you get no/practically no compression). David |
#6
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ABC wrote:
I notice this with the files I work on. After saving, the file gets much bigger, although it has the same format. So I opened a .jpg file of 677k size, did nothing to it and immediately "save as" in . jpg with a different name. My Photoimpact 7 opened a dialog box and I chose 100% quality so I should have no loss. The new file is now 1.7M in size but with the same image( in fact there seemed to be some slight change in the quality) why is this? how can I get a file of the same size and quality ? Is it just Photoimpact?? JPEG compresses images in a way which means some data is lost - the amount of data loss is varied by the quality setting. If you chose no compression then it will be maximum size. What has happened in your situation is that you've opened a 667k file, which decompresses to about 2MB. When you then save the image again you have to re-compress the image again to get it back to 667k - which would require further loss of image data to get it back to that size. If you chose no compression (or actually, no data loss compression) then you end up with a 1.7MB file. This is exactly why people use RAW/lossless image formats, and only save as JPEG when outputting the final image. Each saving of a jpeg will lose more and more data (unless no loss is specified, in which case, you get no/practically no compression). David |
#7
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This is the answer. Thanks.
would tiff solve my problem? I do not think my camera has RAW. On Tue, 23 Nov 2004 17:03:31 -0000, "David Hearn" wrotd: JPEG compresses images in a way which means some data is lost - the amount of data loss is varied by the quality setting. If you chose no compression then it will be maximum size. What has happened in your situation is that you've opened a 667k file, which decompresses to about 2MB. When you then save the image again you have to re-compress the image again to get it back to 667k - which would require further loss of image data to get it back to that size. If you chose no compression (or actually, no data loss compression) then you end up with a 1.7MB file. This is exactly why people use RAW/lossless image formats, and only save as JPEG when outputting the final image. Each saving of a jpeg will lose more and more data (unless no loss is specified, in which case, you get no/practically no compression). David ABC Do not reply by email. ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 100,000 Newsgroups ---= East/West-Coast Server Farms - Total Privacy via Encryption =--- |
#8
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This is the answer. Thanks.
would tiff solve my problem? I do not think my camera has RAW. On Tue, 23 Nov 2004 17:03:31 -0000, "David Hearn" wrotd: JPEG compresses images in a way which means some data is lost - the amount of data loss is varied by the quality setting. If you chose no compression then it will be maximum size. What has happened in your situation is that you've opened a 667k file, which decompresses to about 2MB. When you then save the image again you have to re-compress the image again to get it back to 667k - which would require further loss of image data to get it back to that size. If you chose no compression (or actually, no data loss compression) then you end up with a 1.7MB file. This is exactly why people use RAW/lossless image formats, and only save as JPEG when outputting the final image. Each saving of a jpeg will lose more and more data (unless no loss is specified, in which case, you get no/practically no compression). David ABC Do not reply by email. ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 100,000 Newsgroups ---= East/West-Coast Server Farms - Total Privacy via Encryption =--- |
#9
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Convert the original JPG to TIF whilst editing & only convert back to JPG
when you're sure you have your 'final' image Regards DM "ABC" wrote in message news This is the answer. Thanks. would tiff solve my problem? I do not think my camera has RAW. On Tue, 23 Nov 2004 17:03:31 -0000, "David Hearn" wrotd: JPEG compresses images in a way which means some data is lost - the amount of data loss is varied by the quality setting. If you chose no compression then it will be maximum size. What has happened in your situation is that you've opened a 667k file, which decompresses to about 2MB. When you then save the image again you have to re-compress the image again to get it back to 667k - which would require further loss of image data to get it back to that size. If you chose no compression (or actually, no data loss compression) then you end up with a 1.7MB file. This is exactly why people use RAW/lossless image formats, and only save as JPEG when outputting the final image. Each saving of a jpeg will lose more and more data (unless no loss is specified, in which case, you get no/practically no compression). David ABC Do not reply by email. ----== Posted via Newsfeeds.Com - Unlimited-Uncensored-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 100,000 Newsgroups ---= East/West-Coast Server Farms - Total Privacy via Encryption =--- |
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