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Tue, Dec 11, 2018 4:19 AM
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Lightroom Mobile: Double tap for accurate 100% zoom on iPad Pro
Seems that double tapping to zoom in Lightroom Mobile on iPad Pro is inconsistent and never yields actual 100% image pixel to display pixel view. Initial zoom factor appears to depend on actual image file resolution and is about 75% zoom with image files from my D500, but closer to 50% zoom with files from my D850. Repeatedly double tapping eventually yields something closer to 200% zoom for image files from both cameras. I’ve seen a few posts dating back a year or more on this subject and none have been answered. Are there implementational issues with iOS and/or certain mobile devices with adding this functionality? Needless to say an accurate 100% pixel to pixel view is a very important feature to be able to consistently assess image sharpness/detail and noise.
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Victoria_Bampton_Lightroom_Queen
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2 years ago
Victoria Bampton a.k.a. The Lightroom Queen
www.lightroomqueen.com
Author of Adobe Lightroom Classic - The Missing FAQ and Adobe Lightroom - Edit Like a Pro books.
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roy_mclaren
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2 years ago
Hi Victoria, thanks for the response. Yes, I am aware of this. My images are full size originals uploaded direct from camera to iPad Pro and then added directly to albums in Lightroom Mobile. File information in Lightroom CC mobile confirms full resolution original files, yet I am unable to achieve a true 100% zoom. All my files are stored in cache on the iPad. I have changed settings to locally store original files, but that makes no difference to this issue. I have seen same subject being discussed in other postings with same answers being offered and that's where discussion seems to end with no resolution. Any ideas?
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Victoria_Bampton_Lightroom_Queen
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Victoria Bampton a.k.a. The Lightroom Queen
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Author of Adobe Lightroom Classic - The Missing FAQ and Adobe Lightroom - Edit Like a Pro books.
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roy_mclaren
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2 years ago
Yes, I'll try to do that tonight. In meantime here are some additional details:
All my image files are synced with Lightroom Classic on my desktop, but just to underscore I have originally imported files to iPad and then used Lightroom Mobile to add files to Lightroom Mobile albums. The process is entirely managed on the iPad. Fact that I am then syncing images to Lightroom Classic on my desktop is secondary and should not affect anything.
Also to clarify what I regard as true 100% zoom. If we take my D850 full res images as an example. These images are 8256 pixels long. The 13" iPad Pro screen resolution is 2732 pixels on long axis. This means that at 100% zoom apprx 1/3rd of image should be displayed over the full screen on the long axis. This is never the case. Initially when opening an image and double tapping ~2/3rd's of the image is displayed along the long axis implying around 50% zoom factor. When repeatedly double tapping same image it eventually jumps to higher zoom where apprx 1/6th of image is displayed along long axis. This implies ~200% zoom factor. For true 100% zoom apprx 1/3rd of my D850 image files should be displayed along long axis, right?
Another point is I have same problem with files from my D500, but first zoom ratio is different. With D500 on first opening image and double tapping, again apprx. 2/3rd's of image is displayed on long axis. This time though this implies a 75% zoom factor due to the lower sensor resolution of the D500. When repeatedly double tapping I will again see zoom factor suddenly jump and with D500 files this time with apprx. 1/4 of image displayed along long axis. This corresponds to 200% zoom factor which is same as with D850 files.
So basically 1) when first opening an image and double tapping to zoom, the zoom factor will vary depending on image file resolution, in this case 50% zoom for D850 and 75% zoom for D500 full res. images, and 2) when repeatedly double tapping zoom factor will eventually pop in displaying apprx. 200% zoom factor for both D850 and D500 files.
Regarding process for importing files to iPad and then to Lightroom mobile, here are my steps:
1) Connect XQD card from camera via card reader to iPad Pro
2) iOS Auto import window pops up
3) Select images to be imported and import
4) Open Lightroom CC Mobile on iPad Pro
5) Create new album in Lightroom Mobile
6) Select add photos to album
7) Select images from iOS "last import" and add images to Lightroom album
8) Once images are in Lightroom Mobile album I delete images in the iOS "last import" to prevent uneccessary iCloud storage space use
9) That's it, and then Lightroom Mobile proceeds to upload image files to Adobe Creative Cloud. I am allowing unlimited cache size to maintain local copies on iPad Pro. I have never performed clear cache.
When I then review images in Lightroom mobile I initially see message "Smart Preview" in the file information display and after few seconds changes to "original". Full image resolution information is available and displayed correctly. However zoom function is as described above.
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roy_mclaren
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2 years ago
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roy_mclaren
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2 years ago
1) Processed RAW (NEF) file shot on my D850 and imported to Lightroom mobile as described above. As you can see it is original file at full resolution.
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roy_mclaren
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2 years ago
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Rikk
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Quality Engineering - Customer Advocacy
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roy_mclaren
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2 years ago
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prasand
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718 Points
2 years ago
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roy_mclaren
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2 years ago
I initially entitled my thread with wording "feature request", but an administrator must have removed that wording. Point is true 100% zoom is supposed to be a supported feature with Lightroom Mobile already, so in that sense it was correct to call this a "problem".
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roy_mclaren
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2 years ago
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prasand
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2 years ago
I am using the new iPad Pro 11”, on the latest Developer Beta of iOS, and the iPhone 7 also on the latest Developer Beta. Behavior is the same for both devices, only two zoom levels. I do not use Lightroom Classic and never have. So it causes me to wonder if although the files originated from iOS import, something about Lightroom Classic is mucking up the zoom levels.
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roy_mclaren
44 Messages
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750 Points
2 years ago
I’ll clearly summarize how all different types of image tapping options behave for me:
1) Single tap on image toggles between regular view (with menus) and full screen fit - this works fine
Rest below assumes full screen mode as starting point:
2) First time double tapping on newly opened image (two taps in very quick succession) yields a zoom factor < 100% and depends on image file resolution, e.g., in my case with 13” iPad Pro zoom factor is 75% for D500 and 50% for D850 full resolution NEF files respectively. This is the main issue. According to Lightroom Mobile documentation this should provide a true 100% view, but it does not.
3) Repeat double tapping after zooming in returns image to full screen viewing size
4) If I then repeat double tapping to zoom in and out multiple times the zoom factor will eventually pop to 200%. Behavior is same regardless of image file resolution. I will see 200% zoom factor on both D500 and D850 NEF files. The big variable here is there is no consistency in number of repeated double taps for zoom factor to jump to 200%. Sometimes it happens quite quickly, other time I have to repeat double tap many times to get it to happen. However once zoom factor has jumped to 200% then further double tapping will always toggle between full screen view and 200% zoom, never the lower zoom factor that occurs initially. Also seems that jump to 200% zoom happens more readily with Apple Pencil rather than with finger tapping, but can also be induced with finger tapping.
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prasand
35 Messages
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718 Points
2 years ago
Those steps do not always trigger the break, but it does it consistently enough for me to call it reproducible. If those steps do not work, exit the app completely and try it again. Or just add rotation to the double tapping to increase the probability of triggering the break. The opening of the panel introduces another level of complexity in calculating the position while calculating the zoom level, further increasing the chance of a break.
Point is, it's reproducible despite having never used Lightroom Classic.
My previous assumption that it was doing a 100% zoom is because I was eyeballing the lower resolution images on a smaller screen rather than actually measuring it. But having measured it I see that at no point was the 100% zoom truly 100%.
I imagine the zoom calculation is taking ppi into account, causing the 100% zoom to be incorrect due to the variance of ppi in displays (that or doing something like dpi to ppi math). If the math were based purely on resolution, I doubt there would be room for glitching.
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