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Not true 100% zoom?

PostPosted: Mon Jul 26, 2010 9:52 pm
by lecatpuke
I've noticed this phenomenon for a long time now, and it's really starting to become an issue with some of my macro shots. When I left-click to zoom an image to 100%, it doesn't actually zoom to the full image resolution. See the attached comparison between FPV (top) at 100% and Photoshop (bottom) at 100%.
compare.jpg
compare.jpg (73.98 KiB) Viewed 5677 times

Can someone explain this to me?

Re: Not true 100% zoom?

PostPosted: Tue Jul 27, 2010 5:00 pm
by Axel
Your camera does not store a full-resolution JPEG preview within its raw files.

Re: Not true 100% zoom?

PostPosted: Tue Jul 27, 2010 7:28 pm
by lecatpuke
Axel, thanks for the reply. Unfortunately I experience this problem with JPEGs straight from the camera. I haven't thought to experiment with JPEGs from different sources. FPV tells me the image resolution is 3888px wide, however at 100%, there is very little image stretching beyond my 1680x1050 resolution monitor.

Re: Not true 100% zoom?

PostPosted: Tue Jul 27, 2010 8:15 pm
by Axel
Another possibility is the automatic downscaling that may occur, depending on what maximum texture size is supported by your particular video card in GPU accelerated mode.

Re: Not true 100% zoom?

PostPosted: Tue Jul 27, 2010 9:16 pm
by lecatpuke
Automatic downscaling led me to the answer...

For Smart Image Resizing, I had changed the "Maximum memory usage per image" down to 12MB from 112MB. Originally I did this because at times I could feel the effect of scrolling through large folders of images and the hit it had on my available RAM. I assumed that FPV didn't need much more than the actual image size for memory allocation... apparently I was wrong!

Set it back to 112MB and the image resized perfectly. Thanks!

Re: Not true 100% zoom?

PostPosted: Tue Jul 27, 2010 10:28 pm
by Axel
User-induced downscaling through the program's options was possibility #3 8-)

Glad to know you sorted it out!