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Irfanview: how to zoom-in without having the image blurred; I need it for GUI development to see large pixels.

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What type of files are they, and does if Infranview can't do it, does it have to be that program? – KCotreau Jun 29 '11 at 13:46
    
Usually, it are screenshots. Well, IrfanView is my choice of small and fast image viewer since ages. I've tried a couple of alternatives, but they lack at different areas - mostly in usability. – Mike L. Jun 30 '11 at 7:12
    
The exact file type matters. Some scale (.jpg), some are pixels (.gif) – KCotreau Jun 30 '11 at 7:20
    
I'm talking about screenshots (taken with [Alt+]Print, then pasted), not about viewing files. – Mike L. Jul 1 '11 at 8:38
up vote 40 down vote accepted

I found the solution by reading changelog

New display option: Use Resample for zooming (Menu: View->Display options)

So from "View" menu, select "Display options" and turn off "Use resample".

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1  
I had to adjust zoom for the setting to kick in. – NiteCyper Aug 6 '15 at 5:46

Is the image a high-resolution but low quality? As in, do you see blur before you see pixels? Irfanview isn't really meant as a pixel manipulation tool. You're probably looking more for a photoshop-esque tool. Try GIMP or similar to see if it isn't better suited for your needs.

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What you're looking for is technically known as "Nearest Neighbor Interpolation".

i would use an application like

  • Microsoft's ZoomIt
  • Magnifier
  • Photoshop

they all 'preserve hard edges of pixels'.

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