Upsizing images in RAW

Hi all,

I am wondering what effect on image quality increasing the crop size in CS RAW would have. I have read that this is a way of upsizing images for bigger prints but I would have thought if you only have 10.1 mega pixels that is all you have. Quality must be altered. You thoughts would be appreciated.

Also how large a print would you recomend from my 400D. I shot in RAW and generally 100 ISO if I can. Asssume the shot is sharp etc.

Not sure what you mean by "increasing crop size". If I want more pixels I just use the image size dialog in Photoshop. If you mean should you do in in ACR, sure, if you want, but it won't make much difference either way. Try it and see

Printing FAQ.

I second the "image size" option. Photoshop is good to about 300%. After that third party plug ins do a lot better.

How big it goes more depends on the quality of the image and the software used to enlarge it. Not what camera it was made with.

Thanks for the comments, I assume that there is no degredation in quality this way.

Any flaw is magnified with the rest of the image. That is why a quality imge is needed. Keep in mind the bigger it is, the farther the intended viewing distance.(i.e. Nobody looks at a billboard from 3 feet away.) So what degradation you do get is relative, and if you keep the viewing distance in proper ratio, the image should keep its quality.

red snapper wrote in post #10098190
Thanks for the comments, I assume that there is no degredation in quality this way.

There is no way to add data. Upsizing does not get you higher quality or more resolution, just more pixels. At 300ppi your image will be 8.5 by 13. At 20ppi your at 20 by 13 and at 150 ppi your image is 26 by 17. If you printed an image at 150ppi and upsized an image so that you get a 26 by 17 print at 300ppi I'll bet you couldn't spot a difference even close up. Buy remember, the larger the image, the farther the viewing distance.

As an example, I had some posters made at work. I took the images with my 5D. I printed the posters 8 feet by 6 feet. They looked outstanding.

Thanks again, the viewing distance concept makes a lot of sense. I think I will use this. I am only looking at making a print about 60cm by 40cm so i shouldn't be a drama.