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DPChallenge Forums >> Hardware and Software >> Upsizing in GIMP?
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 01/04/2006 07:53:55 PM · #1
Hi, anyone figured out how to upsize for Stock in GIMP? I thought I was the guru, but DANG I can't figure this out.......

Help?
 01/04/2006 07:55:11 PM · #2
i'm a gimp, but have no clue how to use it.

heh
01/04/2006 08:23:19 PM · #3
Originally posted by saintaugust:
i'm a gimp, but have no clue how to use it.

heh


LOL. Just when I think I have it mastered, something comes along to throw a wrench in my Linux use....lol

01/04/2006 08:32:54 PM · #4
Originally posted by notesinstones:
Hi, anyone figured out how to upsize for Stock in GIMP? I thought I was the guru, but DANG I can't figure this out.......

Help?


Under the Image menu, select ``scale image''. Select the new size and the interpolation method.
 01/04/2006 09:46:13 PM · #5
Originally posted by m:


Under the Image menu, select ``scale image''. Select the new size and the interpolation method.


so, if I increase my pixel count per inch, and override the maximum file size - it will make a file high enough quality for uploading to a stock site???
 01/04/2006 09:49:41 PM · #6
From my experience stock sites don't like resized pics...
 01/04/2006 09:56:40 PM · #7
Originally posted by notesinstones:
Originally posted by m:


Under the Image menu, select ``scale image''. Select the new size and the interpolation method.


so, if I increase my pixel count per inch, and override the maximum file size - it will make a file high enough quality for uploading to a stock site???


I wouldn't know about that. It won't improve the quality at all, in fact any changes in size will more likely reduce quality since you are telling the algorithm to estimate a new image. There's no magic, just a mathematical transform.

I could be misunderstanding the term ``upsizing'', I just read it as ``make a larger size''. If I'm wrong about that, I'm sure someone will politely let me know.

The few stock sites I've seen want the highest quality original, and then generate other sizes from that, including at least one place that created a larger version using interpolation, which is what I assumed you were asking. The whole idea seems silly to me, but I guess it sells better if they perform the enlargement than if a client does, even though there is no good reason to purchase the interpolated higher-res image in place of the original.

edit: I have problems with homonyms.

Message edited by author 2006-01-04 22:09:20.
 01/04/2006 10:01:45 PM · #8
It could just be MY ignorance about stock size showing too. I'll go pull some old threads and try to make sense of it all again...
 01/04/2006 10:04:22 PM · #9
Alamy specifically instructs photogs to "interpolate the images to a minimum of 48MB using professional upsizing software."

They go on to recommend Genuine Fractals, but say CS2 is acceptable as well, as long as you use "bicubic."

I dunno what micro sites want.
 01/04/2006 10:09:27 PM · #10
Originally posted by Konador:
From my experience stock sites don't like resized pics...


Many of them strictly say that you can be kicked off the site for upsizing.
 01/04/2006 10:46:37 PM · #11
Ok, let me try that again using the correct terminology - being green to stock and all....

Does anyone know if GIMP has the ability "interpolate the images to a minimum of 48MB".

"Interpolate " literally translates into increasing the size of the image without adding any new data - am I interpreting this correctly?
 01/04/2006 11:36:35 PM · #12
Originally posted by notesinstones:

Does anyone know if GIMP has the ability "interpolate the images to a minimum of 48MB".


Yeah, but I don't think it would understand it that way. I don't think you can set it to "minumum of 48MB". What they appear to be asking for is an image with 17-million pixels. So find a width and height that when multiplied is that large.

editted: read Alamy's instructions

Originally posted by notesinstones:

"Interpolate " literally translates into increasing the size of the image without adding any new data - am I interpreting this correctly?


Roughly speaking, the result of interpolation is a larger image with no increased informational value.

Message edited by author 2006-01-04 23:48:02.
 01/04/2006 11:42:38 PM · #13
I know this isnt about upsizing but since we have so many GIMP users here Ill pose the question anyway.

Gimp has a feature called Selective Gaussian Blur. Do you know if this is allowed in Advanced editing, I figured it wasnt for basic but may be allowed for advanced. Any thoughts?
 01/04/2006 11:53:11 PM · #14
yup- sounds legal to me :0)
 01/04/2006 11:55:40 PM · #15
I love the effect it creates, sometimes it makes it look a little like an oil painting and Im using it for my January free study so Id hoped it was.
 01/05/2006 12:12:08 AM · #16
I will qualify this by saying I haven't actually gotten anything accepted by Alamy yet, but I am preparing my first CD for them right now.

In CS2 I go to Image -> Image Size and change the "Document Size" to 21 inches on the long side, making sure to use "Bicubic Shaper" resampling method. That ends up making a 48.3MB file.

This is the same technique, but in reverse, that you would use to reduce the size of photos for DPC.

You will want to make sure that the gimp equivilent of the "Pixel Dimensions" increases as well... it should be about 5040 on the long end when you are done.

I hope it's that simple... it sounds like it is.

However, you should follow the instructions of whichever stock agency that you are posting the photo to... some won't want any resizing at all, some want JPGs, some want TIFFs, etc. etc. etc.

Message edited by author 2006-01-05 00:12:54.
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