Take the 2-minute tour ×
Graphic Design Stack Exchange is a question and answer site for Graphic Design professionals, students, and enthusiasts. It's 100% free, no registration required.

I want to enlarge an image to a bigger size. This will cause pixelation. So I want to apply some treatment to it in Photoshop that will suppress some of this pixelation. Of course I cannot generate new pixel information, only smoothen it etc. so that the pixelation is not so much apparent in full views and prints. Example, one effect popular with photographers is to copy the image into a second layer, set its blending mode to overlay or soft light etc., then apply a blur to it. This somewhat smoothens the image. But it also changes its appearance into a glowy kind of look (which is the aim, usually). I want a treatment that will fake the appearance of a higher-res smooth image without too many side-effects.

Any tricks of this kind that anyone knows of?

share|improve this question
    
There are some instructions on the web somewhere where the repeated use of gaussian blur and sharpening produce great results. I have used it but cannot find it again. –  Ray Jan 25 at 0:50

4 Answers 4

up vote 8 down vote accepted

In general, enlarge the image using Bicubic interpolation (sometimes, depending on the image, "Bicubic Smoother" works better, but usually straight Bicubic is more satisfactory), then either use Smart Sharpen to bring back the edge contrast, or copy the layer, set the blend mode of the copy to Overlay, and run Filter > Other > High Pass.

Sometimes you can get a better result if you increase the size by a smaller amount, apply a sharpen (not too much!), then increase it some more, apply another sharpen, etc., until you reach the size you want. This takes patience and a lot of trial and error to make it work for any give image, so I don't recommend it except in extreme cases, but once in a while it will allow you to push enlargement beyond where you can go without that intermediate sharpen.

My experience is that the best approach varies according to the image, the amount of upsizing and the result you're looking for. There is a limit to how far you can scale any image before the result becomes too fuzzy to be useful, and the definition of what is useful depends entirely on your application. For graphic design work it is almost never worthwhile to upsize an image more than about 10%.

share|improve this answer
    
+1 Lol Alan, you are making me useless today. We're answering the same questions, and you're typing a few seconds before me. I'll just come back later :) –  Alexei Dec 26 '11 at 20:59
    
Ha! Sorry about that. I'll bow out for a bit, okay? :-) –  Alan Gilbertson Dec 26 '11 at 22:02
1  
Nah I'm just joking around. As long as someone is making those zeros disappear on the front page it's all good. –  Alexei Dec 27 '11 at 6:33
    
we can all only aspire to the greatness that is Alan. :) –  Lauren Ipsum Dec 27 '11 at 11:13

Print the image out using a higher-quality photo printer onto glossy or matte paper and then shoot with a fairly high power camera. Then pull the image you have shot into photoshop and lay it over the original image. Make the layer 50% translucent so you can scale and warp the image to match the original file. Then adjust the layer opacity accordingly. A lot of the time you can use contrasting effects to give it a richer feel and take away from the low resolution as a final touch.

share|improve this answer
    
As someone who deals with under resolution images, as well as people's attempts at 'cranking up the resolution' everyday, I have to ask that nobody ever does what you have suggested. The only way this could help is if you where after some sort of hazy, blurry, beat up, grungy effect... and there are far easier ways to do that. –  TunaMaxx Dec 6 '13 at 3:11

You may wish to give Genuine Fractals (or Perfect Resize as it's now known) a trial. See half-way down this page for a comparison of bicubic versus GF enlargement.

share|improve this answer

In Photoshop, enlarging should not cause pixelation by default. Go into Edit > Preferences > General... and make sure that "Image Interpolation" is set to one of the Bicubic options (there is even one for enlarging it looks like). Also, if using Image > Image Size... to resize a photo, make sure at the bottom the Image Size dialog you have "Resample Image" checked and one of the Bicubic options selected from the dropdown menu. Other than that... what Alan said.

share|improve this answer

protected by Matt May 29 at 14:18

Thank you for your interest in this question. Because it has attracted low-quality answers, posting an answer now requires 10 reputation on this site.

Would you like to answer one of these unanswered questions instead?

Not the answer you're looking for? Browse other questions tagged or ask your own question.