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Very Large File Sizes

Feb 8, 2014, 16:37
Post: #1
Very Large File Sizes
Hi all,

I'm completely new to GIMP so i'm just asking a basic question here. While are imports into GIMP so big? So a 3 to 5 mb JPEG becomes 100s of MBs in GIMP. Although my computer isn't slowing down it just becomes a cumbersome. Is this normal? Is this how you guys use GIMP?

Cheers,
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Feb 9, 2014, 05:25 (This post was last modified: Feb 9, 2014 05:43 by Wendy Black.)
Post: #2
RE: Very Large File Sizes
Long ago my husband contracted for Dow Chemical and he told me that the Human Resource department was consuming a lot of drive space on the server. His group investigated to find out what was going on in that department. Turned out some temp had the bright idea of scanning in resumes instead of retyping them. The got scanned in as Targa with a TGA extension. My husband told me they might as well have use BMP.

When you save as a JPG there is a quality slider... but I don't care for JPEG format, since you have loss of quality and no alpha. I save my stuff in the PNG. I know that eats up a few more gallons of HD space but my images are not as degraded.

I never tried it but if you keep saving a JPEG over and over at 80% in 10 saves wouldn't it be less than 10%? Like so, 64% 51 41 33 26 21 17 13 11 9% or is does it Load the 80% and keep it at 80%?

===UPDATE===

I guess I was wrong just ran a small image 420 x 900 through and the image held at 80%. However I saved and load a 10% JPEG and guess what. Both the original and the 10% copy used 3.5 MB of RAM in the GIMP. While the saved images sizes were 63.3 KB at 80% and 10.3 KB at 10%.

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Feb 9, 2014, 08:38 (This post was last modified: Feb 9, 2014 08:41 by iForStyle007.)
Post: #3
RE: Very Large File Sizes
(Feb 9, 2014 05:25)Wendy Black Wrote:  ...Turned out some temp had the bright idea of scanning in resumes instead of retyping them. The got scanned in as Targa with a TGA extension. My husband told me they might as well have use BMP.

LOL, & he's probably right. I sometimes use paint for a temporary screenshot pasteboard because it seems like it preserves the original quality well. But as soon as you try a different bit quality BMP or another extension (JPEG, GIF) you can say goodbye to the original screenshot quality XD

Quote:When you save as a JPG there is a quality slider... but I don't care for JPEG format, since you have loss of quality and no alpha.

This is a partial myth / misconception. As long as you use 90$ or heck 100% (90 if your looking to save space) any degradation is minimal to none.
http://photography.tutsplus.com/articles...photo-9299

Also, the initial size of your jpeg opened depends on what MP(mega pixel) quality you took the picture with your camera.

For online graphic design or photo use, JPEG is your best friend, there are ways to change the settings so that you can get the fastest loading images without sacrificing much quality (more flexible; progressive pass & markers to name a few...)

*My PNG recommendation:
- Use for final proofing (offline work, onscreen viewing maybe)
-Temporary HD storage
(If running low on HD space & you need to free up some space, converting some larger image files to HQ Jpeg "100%" isn't a bad idea...)
-For final prints where supported (ask print shops if they support PNG format)
- To preserve original image (backup photo)
Open your original photo with no edits, save as .PNG, highest compression or "8"
; work on a jpeg copy of the PNG then apply similar effects to a copy png of your original once you've planned it all out.
(The jpeg copy would be kinda like a rough draft in this case)
- & This is one of the other ways that JPEG shines, its better for test editing, faster viewing if the image is large.

Here is a good article for when would be best to save what format(with focus on gradients):
http://www.photoshopbuzz.com/saving-a-gradient-for-web/


Quote: I save my stuff in the PNG. I know that eats up a few more gallons of HD space but my images are not as degraded.
I never tried it but if you keep saving a JPEG over and over at 80% in 10 saves wouldn't it be less than 10%? Like so, 64% 51 41 33 26 21 17 13 11 9% or is does it Load the 80% and keep it at 80%?
===UPDATE===
I guess I was wrong just ran a small image 420 x 900 through and the image held at 80%. However I saved and load a 10% JPEG and guess what. Both the original and the 10% copy used 3.5 MB of RAM in the GIMP. While the saved images sizes were 63.3 KB at 80% and 10.3 KB at 10%.
this is probably because the data is temporarely compressed on the HD to save on space.

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