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I've just installed a fresh version of irfanview to convert a large number of images to .PNG, but the output resolution won't budge from 1920x1280. Input files are 8392x5620 .RW2, all plugins installed. So far I've attempted, individually and in combination:

  • disabling resizing altogether
  • enabling optipng
  • forcing resize to 8392x5620 (takes a long time to process, outputs a blurry upscaled mess)
  • set new size as percentage of original: 100%
  • "this is the minimal size"
  • "don't shrink bigger images"
  • looking for anything affecting output res in properties/settings
  • wiping with Revo and reinstalling

I'm at a loss, all of these still output low res images. Has anyone seen this before? It hasn't happened on any of my previous devices.

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  • Are you ready to change the software?
    – Romeo Ninov
    Commented Nov 3, 2022 at 13:53

1 Answer 1

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Apparently, IrfanView is not alone in having issues with the proprietary RW2 format, especially for the very high resolution mode. Both darktable and Raw Therapee had problems in the past, but are worth trying. All three, IrfanView, darktable, and Raw Therapee, are excellent applications, in my opinion, rivaling many commercial products, but each has some limitations.

However, Panasonic had partnered with ISL to handle the proprietary RW2 format, and included a licensed version of SILKYPIX Developer Studio SE with purchase of a camera. It includes batch "development" operations (i.e., format conversion). If you do not have a license through Panasonic, you can download and use the app for 30 days.

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