GCU Forum - JPG Noise

Evelyn_142919 Senior Member artist Posts: 421	JPG Noise Sep 30^th, 2012, 10:11pm Hi all, Can any of you with commercial printing experience tell me if our printing co. has software for removing jpg noise? Some of my early images are in that format and I'd like to know if I need to clean them all up or not waste my time. Thanks, Evie
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Corrie_131338

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Re: JPG Noise
Reply #1 - Oct 1^st, 2012, 2:31am

I don't know of any software that does that automatically - one of our photographers may want to chime in here - as far as I'm aware, you have to use your normal graphics editing program (like Photoshop). I don't know what you use, so here's a link to a Photoshop tutorial that may help.

http://www.darrenhoyt.com/2007/10/10/cleaning-up-grainy-low-quality-digital-phot os-with-photoshop/

You can also do a search in Google or other search engine for tutorials for your graphics editing program of choice.

Corrie
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Susan_142450

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Re: JPG Noise
Reply #2 - Oct 1^st, 2012, 4:49am

Not sure of the resolution you are starting with (which maybe more important than the item being jpg) - but there are tricks to reduces jpg and low res noise, but nothing that will truely recreate anything resembling a hi-res image. In short, reducing "noise" is telling pixels to combine their info and create a more even blending (I may be explaining this badly) and so reducing noise may be lowering the sharpness.

Once the image is 150 or 72 dpi (at 5x7 for example), you will never be able to res- up and get an image acceptable for GCU. Many cameras shoot in jpg, but if you choose a large file size, that's a different story - the image is usually huge (in inches) and you can adjust your dpi and dimensions with no problem.

I use a book called "Photoshop Lab Color" by Dan Margulis that explains color correction, re-sizing images and more in LAB color and the reasons correcting in LAB is more successful.

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Doreen_137017

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Re: JPG Noise
Reply #3 - Oct 1^st, 2012, 7:46am

I have to agree with the others and no, I'm sure that GCU printing services don't have access to your image to work on it.

I have to guess that it's not that these images are jpg, but that they are of low-resolution that is causing issues. I upload my standard cards to GCU as 300dpi jpgs and they are fine for this purpose, it's nearly impossible to remove low-resolution damage and/or artifacts well enough to have a high-quality image to sell.

Here are a couple of articles on the blog on the subject that might help:

Artifacts … the Facts http://gcucommunity.com/2012/03/19/dash-of-inspiration-artifacts-the-facts/

Understanding Digital File Types: http://salonofartnewsletter.weebly.com/1/post/2011/01/photography-tip-for-januar y-2010.html

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Evelyn_142919

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Posts: 421

Re: JPG Noise
Reply #4 - Oct 2^nd, 2012, 12:27am

Thanks ALL for your input. My images are 300 dpi. After I close them once and reopen them, there will always be artifacts. Each time the image is opened it gets a bit worse. For the past 18 mos. or so, I no longer upload jpg's ~ only png's. But in the beginning I used jpg's exclusively.

Doreen, I didn't expect printing services to actually 'work on' my image, unless it was thru the regular printing process. Knowing the problems I'm having with jpg's, I thought they might have some form of auto-correction for jpg images.

Thanks everyone for the links!

Evie

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Doreen_137017

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Re: JPG Noise
Reply #5 - Oct 2^nd, 2012, 8:25am

Quote from Evelyn_142919 on Oct 2^nd, 2012, 12:27am:

Thanks ALL for your input. My images are 300 dpi. After I close them once and reopen them, there will always be artifacts. Each time the image is opened it gets a bit worse. For the past 18 mos. or so, I no longer upload jpg's ~ only png's. But in the beginning I used jpg's exclusively.

Doreen, I didn't expect printing services to actually 'work on' my image, unless it was thru the regular printing process. Knowing the problems I'm having with jpg's, I thought they might have some form of auto-correction for jpg images.

Thanks everyone for the links!

Evie

Hi Evie ... that is typical of a compressed file format. Jpgs should never be opened, worked on and re-saved, you will see noticeable degradation each time it is re-saved. Files should be worked on in a non-compressed format so that anytime you open to make a change it does not re-compress, then after the changes you save as a new jpg to replace the old one. Now I get what you are experiencing

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Evelyn_142919 Senior Member artist Posts: 421	Re: JPG Noise Reply #6 - Oct 3^rd, 2012, 7:45am Thanks, Doreen, for your input on this topic. I read your article on artifacts ... it was very informative and enlightening! And I appreciate your helpfulness on this forum, and Corrie, Susan, and others who are always eager to help. Your contributions are one of the reasons GCU is the Best! ♥~♥Ƹ̵̡Ӝ̵̨̄Ʒ♥~♥
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