Display scaling problem on iMac Retina


FRV 1.4.8
macOS 10.12.6
2017 iMac Retina 5K
Enjoying the trial of FRV except for a problem with the display scaling on my Retina screen.
I set the app's image resampling method to none and found that the following incorrect display scaling is happening:

  • At 100% zoom, the 100% scale image is displayed at 200% scale with 4 display pixels being used for each image pixel.
  • At 50% zoom, a 50% scale version of the image is displayed at 200% with 4 display pixels being used for each pixel of the 50% scale image.

The result is that it's not possible to view the image as 1 display pixel per full-scale image pixel.
Hoping you can fix this for the next update to the otherwise excellent app.

Dear Sir:

Please check FastRawViewer Preferences -> Interface / Zoom -> "Use Logical pixels for zoom calculation", maybe it is the control you are looking for:

o If turned on (default, "legacy" behavior), then the pixel in the screen is considered to be the "logical pixel" (in the case of Retina, it's a block of 2x2 "physical" pixels) and the calculation of the zoom size is done in these units.

o If turned off, the zoom value is calculated in "physical pixels", so for Retina screens the displayed zoom value will now be doubled, and at 100% zoom the image will be half the size compared to "legacy" behavior.

This is page 132 of FastRawViewer Manual.

For your convenience, FastRawViewer Manual comes with the installation (main Menu - Help - "PDF Manual") and is searchable. You can also download it separately in higher resolution from the usual download location, https://www.fastrawviewer.com/download - direct link is http://updates.fastrawviewer.com/data/FastRawViewer-Manual-ENG.pdf

Thanks for the very prompt reply.
Yes, that's the control that I should have found by searching the manual. :)
Sorry for wasting your time, and I'll almost certainly buy a licence.

Dear Sir:

No time wasted at all, we are always happy to answer questions. This also gives us an opportunity to advertize our Manual ;)

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