Lightroom CC for mobile (iPhone): Image Blurry after Zooming to 100% and Panning

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  • Problem
  • Updated 2 weeks ago
  • (Edited)
Steps to reproduce:

1. In any single photo view (Edit/Info/etc), double click the photo to zoom to 100%. The part of the photo on the screen is sharp.
2. Move the view port to see another part of the photo (by holding my finger on the screen and moving the finger). The part of the photo on the screen is blurry and it seems a low-res image being enlarged to more than 100%.
3. Single-tap the photo refreshes the screen and now everything on the screen looks sharp.

Other information:

I could reproduce this for both .CR2 files uploaded from a computer and DNG photos taken by the Lightroom CC app on the phone. I'm using iPhone SE with the latest iOS.

I can try to upload a screen shot if needed.
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Xin Liu

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Posted 1 month ago

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Roy McLaren

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Yes, I noticed this behavior after updating to Lightroom Mobile v4.1. After zooming and panning image seems to take MUCH longer to reach full, high resolution. Often as you describe only way to get image to refresh and achieve full resolution is to single-tap to toggle view mode. I’m using a mid 2017 iPad Pro 13”.

BTW, not sure that you should refer to zoom view as 100%. See my thread here:

https://feedback.photoshop.com/photos...

....
(Edited)
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Rikk Flohr, Official Rep

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I just tested your steps on an iPhone 7 and a late 2017 iPad standard on Canon 5D Mark IV files (Not set to store locally) and I cannot reproduce what you are seeing. 

Can you provide more information about your device specs and your images where you are seeing this issue?
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Roy McLaren

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This is exactly the behavior I see with 2017 iPad Pro, but with some additional complexities regarding actual zoom factor when behavior is most pronounced (as discussed below). When panning, the new area of the image entering the view is blurry and will not refresh unless I single tap screen or change an image adjustment setting.
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Rikk Flohr, Official Rep

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It looks like items in Detail (Sharpening and Noise Reduction) may not be getting applied as you pan/zoom.  See this Photoshop overlay:
(Edited)
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Xin Liu

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I don't think the problem is some algorithms are not applied. I didn't process this photo at all; the processing is just the default after import. I don't think the original photo is that bad without processing. I observed the same blurriness for photos taken with Canon 6D II.
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Roy McLaren

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Quick question Rikk, anyone. How do I take screenshots using iPad Pro whilst getting file size to meet the 2MB limit on this site? I have been trying to send example screenshots in support of this and another thread, but keep get a "server error" on attempted upload.
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Rikk Flohr, Official Rep

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I use Photoshop to reduce the size of the capture.  Screen captures are PNG and they are much larger than JPEG. Converting them to JPEG may be enough. 
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Roy McLaren

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Hi Rikk,


I'm using 12.9" mid/late 2017 iPad Pro with latest iOS. In my case camera files are Nikon D850 14-bit lossless compressed NEF (RAW) average size is 50-60MB per file. Prior to upgrade to Lightroom Mobile v4.1 my files would very quickly reach full resolution after a zoom and panning operation. Now with v4.1 after a zoom and panning operation images will remain blurry for unspecified period of time, often indefinately. There are two ways to force the zoomed and panned image to refresh and pop to full resolution and these are 1) to single tap to toggle screen view as OP describes, or 2) change any image setting, such as exposure, contrast or any other setting whatsoever. These two things will make image refresh and reach full resolution whilst zoomed.

Just to add that I also do not have files set as store locally on iPad, but they were directly uploaded from camera to iPad and are currently cached on iPad. Cache is currently around 125GB on 250GB iPad Pro and at some point I will have to clear it to free space. Reason I have not done so, so far is that I have been assuming having images cached on iPad will make image review and operations faster (assuming that if not stored on iPad then full resolution image would have to download from cloud taking more time?)
(Edited)
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Roy McLaren

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Actually Rikk, to further complicate this discussion, this issue is most pronounced when I zoom into 200%. I hear you say, “200%”?! If you recall I started the other thread on inconsistent zoom factor when double tapping image and in my case I can easily induce a 200% zoom factor when performing multiple double tap operations with Apple Pencil. In fact its so easy for me to achieve this 200% zoom factor that I have started to become accustomed to using it and this is where I really encounter this issue of blurry image after zooming and panning. At the “regular” zoom factor, that happens to be ~50% with my D850 NEF files (~75% with my D500 NEF files) the image seems to refresh more readily after panning. I understand how this finding might complicate ability to repeat this issue if you cannot first induce what we have been terming the “200% bug” in the other thread. In fact makes me wonder what zoom factor OP was observing this issue at? I don’t think it will be obvious to many what zoom factor they are viewing at because most (as I did initially) will assume it is 100% because that’s what we’ve been told it should be.

Here’s link to the other thread for reference:

https://feedback.photoshop.com/photos...
(Edited)