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

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jturk

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does using the Snipping Tool reduce the quality of the image when

converted to jpg format?

im using the snipping tool to capture images of paused youtube videos. im wondering if the image quality is reduced when converted to jpg format?

ive already done a few & if there is a difference its very subtle but it looks like there may be some difference. can you confirm whether there is or not?
 

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It depends. Are you using a convertor or simply saving it as a .jpg format? .jpg will normally be slightly worse quality than a .png file but in the end it really depends on what you're trying to screenshot.

Take a look at the following quote, it might help.

http://www.labnol.org/software/tutorials/jpeg-vs-png-image-quality-or-bandwidth/5385/ said:
GIF format is limited to 256 colors and is a lossless compression file format, a common choice for use on the Web. GIF is a good choice for storing line drawings, text, and iconic graphics at a small file size.

PNG format is a lossless compression file format, which makes it a common choice for use on the Web. PNG is a good choice for storing line drawings, text, and iconic graphics at a small file size.

JPG format is a lossy compressed file format. This makes it useful for storing photographs at a smaller size than a BMP. JPG is a common choice for use on the Web because it is compressed. For storing line drawings, text, and iconic graphics at a smaller file size, GIF or PNG are better choices because they are lossless.
Click to expand...
 

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how do i save a file in PNG format if it doesnt give me the option

rather it gives me the option of jpg or "all files" & thats it.

idk what all files means btw.
 

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What program are you using? It probably doesn't support saving as .png.

All files just allows you to see all files and give any extension, but that doesn't mean it'll work. The program has to have the code to write the file and if it does it's usally list it as a save as type anyway.

Use can use All Files in Notepad to save a txt file as a bat or cmd because these are read as plain text.
 
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How are you saving the pictures and what is the source of the pictures i mean like direct from website etc etc??You can open pictures in paint then click on save as and then choose .png format from the list.
 

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irfanview - free - is good too. lots of file save formats .
 

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how do i open a picture in paint so that i can save in png format

i want to save in png rather than jpg so that i dont lose any of the quality.

also, how much of the quality is lost by saving in jpg instead of png?

im saving pics directly from websites btw.
 

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'save as' gives other file formats; also irfanview allows various file formats (irfan is free ).
 

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to open a pic in paint ,once its downloaded ,right click it and select open with then choose paint from the list
 

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im saving pics from websites.
 

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

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jturk said:
im saving pics from websites.
Click to expand...

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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I believe none if your saving from the web because you are not modifing the picture your only copying it.
 

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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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, every edit and save as a JPEG file will have a detrimental effect on image quality.
Click to expand...

wow, thanks barman, that i never knew. any reason why this happens -- short explanation ? lol :o
 

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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.


jturk said:
im saving pics from websites.
Click to expand...
 

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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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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.
paint saves.png
 

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manhunter2826 said:
, every edit and save as a JPEG file will have a detrimental effect on image quality.
Click to expand...

wow, thanks barman, that i never knew. any reason why this happens -- short explanation ? lol :o
Click to expand...

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 :D
 

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thanks so much barman and rep given.
 

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