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Old 15th May 2012, 07:56 AM   #1
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Default What is the most suitable format for pictures.

What format (jpg/png/gif) is the most suitable for attaching pictures such as schematics etc to a thread ?

I always use jpg's because I know these are universally able to be "read" by all. Does the same apply to png and gif which give clearer results on fine diagrams and so on ? Can everyone open those ?
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Old 18th May 2012, 03:35 AM   #2
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I am guessing that .jpg's are best, as on my computer they seem to take up the least space.
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Old 18th May 2012, 04:32 AM   #3
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Quote:
Originally Posted by Mooly View Post
What format (jpg/png/gif) is the most suitable for attaching pictures such as schematics etc to a thread ?

I always use jpg's because I know these are universally able to be "read" by all. Does the same apply to png and gif which give clearer results on fine diagrams and so on ? Can everyone open those ?

Any line work such as drawings or schema should be saved as png or gif. You should endeaver to reduce the number of "colours" to as few as you can get away with (ie a B&W schema can usually be accomodated in 2 or 4 colours).

jpeg is a really bad format for these kinds of things, as it is lossy and adds noise to this kind of image, making it "fuzzy"

All browsers qill read any of these 3 formats.

dave
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Old 18th May 2012, 06:52 AM   #4
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Thanks Dave.
I tend to use Vista's snipping tool to grab screen shots and always post in jpg format. Just tried experimenting and I can see that the "lines" are much clearer when zoomed in png and gif but text and the resistors are still not good.

Also tried using "Prt Screen" and pasting into paint and still not good on text.
Thinking about it maybe the resolution isn't there and I am expecting to much.

I'll post these three images to see how they look for real on here. On my PC they look essentially similar.

Edit... and the gif looks worse to me here.
Attached Images
File Type: jpg jpg test.JPG (135.0 KB, 77 views)
File Type: png png test.PNG (82.4 KB, 72 views)
File Type: gif gif test.GIF (47.3 KB, 70 views)
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Old 18th May 2012, 07:58 AM   #5
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Originally Posted by Mooly View Post
I can see that the "lines" are much clearer when zoomed in png and gif but text and the resistors are still not good.
That is the limitation of whatever is drawing to your screen.

Quote:
maybe the resolution isn't there and I am expecting to much.
Exactly. Also the choice of pallette in your example is not very good.

Quote:
I'll post these three images to see how they look for real on here. On my PC they look essentially similar.... and the gif looks worse to me here.
They are snapshots of the screen, they'd look identical to the screen if they were perfect. jpg is adding artifacts... the png is reproducing your screen, something in the post processing screwed up the gif... it should look identical to the png *but have a slightly larger screen size)

Your images blown up to 400%, screen-snapped and saved as a max colour gif (to preserve the jpg artifacts)

Click the image to open in full size.

dave
Attached Images
File Type: gif Screen-shot-bloeup.gif (63.7 KB, 137 views)
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Old 18th May 2012, 10:09 AM   #6
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Thanks,
I think the png seems the best (same quality as jpg but much smaller file size).

I can see now that it's the resolution of the original that's at fault. It's me thinking that for such "basic" drawings the file sizes would include have more detail. If I zoom in using the actual program creating the picture then it's good.

The gif one does have slightly "dotty" appearance on the PC too.
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Old 18th May 2012, 04:55 PM   #7
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png >>> jpg, i hate the fuzz in a jpg.

The dots in the gif are not inherent, as i said, if properly processed it will be identical to the png.

dave
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Old 18th May 2012, 10:23 PM   #8
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I find that GIF conversion usually gives the dotty background when it's anything but white. The schematics from LT Spice are an example, I don't like them. JPG fuzzes the lines everytime you edit and save the file. I use print screen and Paint alot for PSUD2 or editing PDF schematics. For original schematics I use paint and my own librarys I built. Kind of a pain to just use cut and paste but the files are small when saved as GIF.
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Old 18th May 2012, 11:07 PM   #9
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I find that GIF conversion usually gives the dotty background when it's anything but white. T
That is the operator (or a program that doesn't work well) not the gif... This gif faithfully reproduces the jpg, png, and the gif.

Click the image to open in full size.

dave
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Old 19th May 2012, 06:35 AM   #10
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Thanks for the extra info folks. I tried using gif a few times to experiment yesterday but get the "dots" each time (particularly with Spice). It does seem to be as Loudthud mentions and that the coloured background is the problem.
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