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Windows 7: how much quality is lost when i save in jpg rather than png format

08 Feb 2012   #11
manhunter2826

Windows XP - Now Windows 7 Home Premium (64-bit).
 
 

why keep starting new threads on same subject ???? lol.


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08 Feb 2012   #12
Influx

Win7 Ultimate x64 SP1 / WCP x64 / Ubuntu 11 x64
 
 

Quote   Quote: Originally Posted by jturk View Post
im saving pics from websites.
PNG is great for animations, graphics, etc. It's fine to use JPEG on camera pictures. Just don't resize them, because this certainly removes details.
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08 Feb 2012   #13
Duzzy

Windows 7 Ultimate x64
 
 

I believe none if your saving from the web because you are not modifing the picture your only copying it.
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08 Feb 2012   #14
Barman58

Windows 10 Pro x64 x2 Windows 10 Enterprise x64, Ubuntu
 
 

Except for certain internal processes involving metadata changes, every edit and save as a JPEG file will have a detrimental effect on image quality. If you wish to retain quality of an image that requires editing, save in a lossless format, TIFF, PNG, etc, and only convert to JPEG at the final stage before uploading.

Saving a file from the snipping tool to JPEG, which you are not going to edit is OK as the JPEG compression process is only performed once, thogh it will degrade to some extent, set the snipping tool JPEG settings to highest to retain as much detail as possible.
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08 Feb 2012   #15
manhunter2826

Windows XP - Now Windows 7 Home Premium (64-bit).
 
 

Quote:
, every edit and save as a JPEG file will have a detrimental effect on image quality.
wow, thanks barman, that i never knew. any reason why this happens -- short explanation ? lol
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08 Feb 2012   #16
wanchoo

Windows 7 Pro with SP1 32bit
 
 

In my opinion there is no loss in quality that most of us will be able to notice. Same as listening to an mp3 which is a lossey format and Flac/Ape which are lossless formats where even trained ears can't find any difference.


Quote   Quote: Originally Posted by jturk View Post
im saving pics from websites.
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08 Feb 2012   #17
wanchoo

Windows 7 Pro with SP1 32bit
 
 

Another method is to first open Paint, click on Open and browse to the picture that you want to look at and click on it.
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08 Feb 2012   #18
Britton30
Microsoft MVP

Windows 7 Ultimate X64 SP1
 
 

Many images from the net will only save in either .bmp or .jpg format directly. You need to first save the pic you want then as said right click the image, Open With, select Paint. Once it's opened in Paint, click the icon shown below and then choose Save as .png and delete the original.
how much quality is lost when i save in jpg rather than png format-paint-saves.png


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08 Feb 2012   #19
Barman58

Windows 10 Pro x64 x2 Windows 10 Enterprise x64, Ubuntu
 
 

Quote   Quote: Originally Posted by manhunter2826 View Post
Quote:
, every edit and save as a JPEG file will have a detrimental effect on image quality.
wow, thanks barman, that i never knew. any reason why this happens -- short explanation ? lol
a Jpeg image discards information that is deemed to be un-necessary for the human eye to "see the image", this reduces the size, but also removes subtle detail. As this process is repeated every time a file is saved, the image quality is reduced each time.

An interesting experiment is to take an image, and save to a new name, and compare the quality of the images, (setting the compression to high will speed up the process).

When the jpeg system was developed the web was young and image quality was low so this loss was not really an issue, but today with high bandwidth, and HD screens the compression can be noticeable with "artefacts", (stray pixels and blocky images).

If you wish to retain quality for the web, the PNG image which has a better lossless compression is the way to go.

I do keep Jpeg images from my own camera but the system I use keeps a master copy, and a list of changes and "publishes" a copy for upload as required. A lot of my original images are stored as digital negatives (Raw), format which creates huge files but can be edited continuously without detail loss.

Hope that's short & simple enough, unfortunately image compression is a complex subject
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08 Feb 2012   #20
manhunter2826

Windows XP - Now Windows 7 Home Premium (64-bit).
 
 

thanks so much barman and rep given.
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 how much quality is lost when i save in jpg rather than png format




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