Re: [opensource-62] need image resolution graphic design advise

From: Collin
Sent on: Friday, June 29, 2012 6:48 PM
Ahh, I was mistaken about what you wanted to do.  I'm pretty sure Photoshop has a noise reduction tool built in that might work for that.  Or you could try to see if there is a plugin for the gimp [Just checked, and there is].  Also on the commercial side of things, I've used noise ninja before, there is a standalone version, but it also comes integrated with Corel Aftershot pro which has the benefit of running on linux. (Side note, I haven't tried the software since before Corel bought them out, but it used to be a pretty solid program, not quite as polished as something like Adobe Light room, but a solid piece of software none the less)   

Or, depending on what sort of photo it is, you might be able to cut some of the grain by hand just using a blend or blur tool and doing it manually.

As for sharpening, google high pass sharpening.  You should be able to implement it in the gimp (I've only done it in photoshop).  Usually, any time you sharpen something, you'll bring out more noise (hence why you'll want to try to trim some of the noise back before hand), but once again, if you don't mind going in by hand, you can edit the mask a bit and blow away the noisy parts in the mask so they don't get sharpened in the final product.  


On 29 June[masked]:45, mowgli <[address removed]> wrote:
useful yes.  i dont want to resize it.  i just want to get rid of random grainy excess dots & perhaps sharpen image a bit.  size is ok.

how would i adapt your advised methods below for that since they seem like they will all enlarge it?

its a 417x418 png presently 96 dpi for a print brochure.  sigh.

btw, thanx!

On Fri, Jun 29, 2012 at 5:10 PM, Collin May <[address removed]> wrote:
I believe that it is [or used to be] common practice to do bicubic upsampling in increments of about 110% or so until you reach your desired size.  There are also some commercial packages like alien skin and genuine fractals that are supposed to work pretty well, but I don't have any experience with them.  Honestly tho, its been a while since I've messed with any of this stuff.  

Additionally, it seems like it would depend on how big of an enlargement you need and what sort of print media you're talking about.  If its going to a newspaper or something, you should be fine.  I've had some pretty grainy stuff that looked decent in newsprint.  I've never dealt with a magazine before, but it doesn't seem like it would be very forgiving.

It seems like it would also depend on what sort of images they were.  

Not sure if any of that was actually useful, just thought I'd throw in my 2 cents


On 29 June[masked]:17, mowgli <[address removed]> wrote:
i have some low rez images from the web i need to adapt to print media quality.  i have read about upsampling/uprezzing images.

if you have any experience/advise/feedback on achieving (or the futility of achieving) the above, pls share with meh.  thanx.





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