Scans not working in Photoshop

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In the midst of doing a large batch of scans I've discovered that some of the scans cannot be parsed by Photoshop. I've been scanning LP covers in portions and then stitching them together, and those files work fine. However when I use the exact same settings but select smaller portion of the art, the results when opened in PS look like this:



I'm scanning with an Epson Perfection V550 Photo scanner, capturing as 800 dpi TIFFs via Apple's "Image Capture" software. The scans display with no errors using Apple's "Preview" app.

Any guesses?

Thanks,
Jeff
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Jeffrey Economy

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Posted 3 months ago

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Steven Seelig

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Not sure if our experiences are related, but I have tried to get either Apple or Adobe to address a similar issue that is pretty well defined for a couple of years.  The problem occurs across 4 different scanners from 2 different manufactures and over 3-4 different computers.  Others on Photo.net have readily confirmed the bug that I will describe.  I am on the Mac OS 10.13.4.  

If you scan an image with the capture box perfectly horizontal in Image Capture, it will scan properly.  If you scan an image with the capture box at anything but perfectly horizontal in Image Capture, the resultant file will look fine in Preview, but will be clipped just like yours above in Photoshop.  This is true for saving to tiff files.  jpeg, psd files seem to be ok

If you open the corrupted image file in PS that looks ok in Preview and simply go to File>Export and deselect the 'Alpha' box, the resultant tiff file will look ok.  As a word of caution, my impression is these files are smaller than I would anticipate so I am suspicious as to whether all of the data has been captured.  I will try to specifically test that in a little while.

This issue has made my scanning projects considerably more difficult.

So, have you rotated the capture define box? 
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Jeffrey Economy

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Aha! That must be it, the smaller captures were done with the selection box rotated. How aggravating, but also somehow re-assuring that it's a known bug.

Since these TIFFs are being made to be dropped directly into a film project timeline, I can probably get away with not having to do much in the way of alteration. In the event that I want to make tweaks, I'm trying your suggestion about de-selecting the Alpha layer. However, I'm not clear on which export option you're using to do that, can you kindly elaborate (i.e. is that found within an "Export Preferences" sub-menu, or...)?

Thanks so much!
Jeff
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Steven Seelig

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In Preview go to File and then Export.  In that dialog box is the alpha deselection, BUT BEWARE that the file size of the rotated capture area is very small compared to an identical sized area but scanned horizontally.  You can look at two files (one captured with a rotated capture box and one with a horizontal capture box) here https://www.dropbox.com/sh/iah53l3of5ewzky/AADMHJ_ob8OD6mVgiG_rzx4va?dl=0


I hope someone from Adobe will read this thread
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JEA

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I believe the reason the file size is so small is due to Jpeg Compression being used.

If you open one of the offending scans into something like Graphic Converter and look under the ExifTool you can see what compression was used in tiff.

(Edited)
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Steven Seelig

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Look at the two files 'size test horizontal' vs 'size test rotated'  The only difference is one is scanned horizontally and the other rotated.  The image you looked at is part of another related story...sorry about the confusion.
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JEA

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I should add you can see the Compression used in photoshop under File>File Image>Raw Data, but if one doesn't know what the numbers mean, it's not of much use.

As it happens the definition of the compression numbers are listed here, so it says 7 in photoshop which corresponds to Jpeg Compression in the chart.

https://en.wikipedia.org/wiki/TIFF
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Jeffrey Economy

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Very instructive - thank you again for your help, it's greatly appreciated.