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#1
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Do you use lossless JPEG recompression tools?
There are a number of tools available which can do "lossless" compression of jpeg files, they get around 20-25% compression. There are both commercial/proprietary (StufIt) and free/open-source options (PackJPG, PAQ etc...). Have you tried any such tool? Do you use any? I am in process of publishing an image compression benchmark and want to know what is in actual popular use and what all is only academically interesting. And if not, then why not? what do you think is missing in them that would make you change your mind? Sachin Garg [India] www.sachingarg.com | www.c10n.info |
#2
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Do you use lossless JPEG recompression tools?
On Fri, 18 Jan 2008 10:21:18 -0800 (PST), Sachin Garg
wrote in : There are a number of tools available which can do "lossless" compression of jpeg files, they get around 20-25% compression. There are both commercial/proprietary (StufIt) and free/open-source options (PackJPG, PAQ etc...). Have you tried any such tool? Do you use any? I am in process of publishing an image compression benchmark and want to know what is in actual popular use and what all is only academically interesting. And if not, then why not? what do you think is missing in them that would make you change your mind? I don't use them because disk space is so cheap that I don't want any additional processing overhead. -- Best regards, John Navas Panasonic DMC-FZ8 (and several others) |
#3
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Do you use lossless JPEG recompression tools?
On Jan 19, 12:17 am, John Navas wrote: On Fri, 18 Jan 2008 10:21:18 -0800 (PST), Sachin Garg wrote in : There are a number of tools available which can do "lossless" compression of jpeg files, they get around 20-25% compression. There are both commercial/proprietary (StufIt) and free/open-source options (PackJPG, PAQ etc...). Have you tried any such tool? Do you use any? I am in process of publishing an image compression benchmark and want to know what is in actual popular use and what all is only academically interesting. And if not, then why not? what do you think is missing in them that would make you change your mind? I don't use them because disk space is so cheap that I don't want any additional processing overhead. Yep, they are a bit slow. Around 12 seconds per 8 MegaPixel Jpeg on my Pentium4. Is it too slow even for backups? Will your opinion change if it was, say, 1 sec per image? Sachin Garg [India] www.sachingarg.com | www.c10n.info |
#4
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Do you use lossless JPEG recompression tools?
On Fri, 18 Jan 2008 12:35:46 -0800 (PST), Sachin Garg
wrote in : On Jan 19, 12:17 am, John Navas wrote: I don't use them because disk space is so cheap that I don't want any additional processing overhead. Yep, they are a bit slow. Around 12 seconds per 8 MegaPixel Jpeg on my Pentium4. Is it too slow even for backups? Yes -- I like to be able to access my backups directly. Will your opinion change if it was, say, 1 sec per image? It's not only the overhead, it's the hassle. What I'd rather have is an alternative to JPEG that has the extra compression built-in. -- Best regards, John Navas Panasonic DMC-FZ8 (and several others) |
#5
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Do you use lossless JPEG recompression tools?
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#6
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Do you use lossless JPEG recompression tools?
On Fri, 18 Jan 2008 17:51:05 -0500, "jean" wrote:
Time for backups are not too important, I copy my files to another machine, to a portable USB drive and I have just added a network drive (500Gb). Just start a copy before going to bed and sleep over it. Jean, It is relatively easy to have a backup done automatically every night when you are sleeping. The software I use is: http://www.smsync.com/ which I saw recommended by a computer columnist (probably the one that is quoted on their home page). What I haven't done is to set it up to back up the most important files nightly to one of my web sites, where I have spare storage. Don www.donwiss.com (e-mail link at home page bottom). |
#7
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Do you use lossless JPEG recompression tools?
On Jan 19, 1:49 am, John Navas wrote:
On Fri, 18 Jan 2008 12:35:46 -0800 (PST), Sachin Garg wrote in : On Jan 19, 12:17 am, John Navas wrote: I don't use them because disk space is so cheap that I don't want any additional processing overhead. Yep, they are a bit slow. Around 12 seconds per 8 MegaPixel Jpeg on my Pentium4. Is it too slow even for backups? Yes -- I like to be able to access my backups directly. Will your opinion change if it was, say, 1 sec per image? It's not only the overhead, it's the hassle. What I'd rather have is an alternative to JPEG that has the extra compression built-in. Yep, this makes sense. Can I have any more opinions? Is anyone else here using these tools? Sachin Garg [India] www.sachingarg.com | www.c10n.info |
#8
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Do you use lossless JPEG recompression tools?
On Jan 19, 3:51 am, "jean" wrote:
"John Navas" a écrit dans le message de news: ... On Fri, 18 Jan 2008 12:35:46 -0800 (PST), Sachin Garg wrote in : On Jan 19, 12:17 am, John Navas wrote: I don't use them because disk space is so cheap that I don't want any additional processing overhead. Yep, they are a bit slow. Around 12 seconds per 8 MegaPixel Jpeg on my Pentium4. Is it too slow even for backups? Yes -- I like to be able to access my backups directly. Will your opinion change if it was, say, 1 sec per image? It's not only the overhead, it's the hassle. What I'd rather have is an alternative to JPEG that has the extra compression built-in. Time for backups are not too important, I copy my files to another machine, to a portable USB drive and I have just added a network drive (500Gb). Just start a copy before going to bed and sleep over it. It is more important for me to be able to read old files rather than rely on a piece of software that may not be aroung or supported on a future processor or operating system. This concern might be true for proprietary formats from unknown companies, but is it really a concern when its an open-source solution (or if its from a dependable company)? Sachin Garg [India] www.sachingarg.com | www.c10n.info |
#9
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Do you use lossless JPEG recompression tools?
Sachin Garg wrote:
[] Can I have any more opinions? Is anyone else here using these tools? Sachin Garg [India] www.sachingarg.com | www.c10n.info Not using - never seen any need. David |
#10
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Do you use lossless JPEG recompression tools?
Sachin Garg wrote:
[] This concern might be true for proprietary formats from unknown companies, but is it really a concern when its an open-source solution (or if its from a dependable company)? Any proprietary format is dubious - look at the difficulties in reading old word-processor formats. Open-source can be the kiss-of-death for a project, as the programmers loose interest and move onto something else. Seen that happen time after time. Stick to standard JPEG. David |
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