Previously I must have simply opened the wrong test file in VueScan, or made some mistake in ImageMagick or a VueScan setting. Now when I try to open any of my ImageMagick-converted slides in VueScan, I can do infrared clean. Maybe the authors of ImageMagick could do a comparison of these two files and determine what the difference is? This wouldn't just benefit me, but also the many other users of VueScan who may also use ImageMagick. That's why I'm hoping there's a simple difference between these two files which is the difference between "alpha" and "infrared." Does that makes sense? The problem is, I've scanned hundreds of slides using extremely slow settings - literally weeks and weeks of work - and converted them with ImageMagick, and if only I could convert these back to "infrared" TIFFs, I wouldn't have to rescan them. I'm an archivist, and going forward I can simply leave future scanned TIFFs from VueScan untouched, so that the infrared channel is not lost. In other words, ImageMagick somehow changed or discarded the information saying this alpha channel is an "infrared" channel (even though it's still basically the same file size). This seems to retain the alpha channel, and the file size is almost exactly the same, but when I open this file in VueScan, infrared cleaning is now unavailable. If I copy the above slide into a new TIFF using ImageMagick, I get this file. This file has not been touched since it came out of VueScan. I can later re-open this file in VueScan and do "Infrared clean," meaning the software uses the infrared channel to remove the dust in the slide. That is, RGB + infrared channel (infrared representing dust in the scanned slide). It is outputted as a 64-bit "RGBI" image. Here's one scanned image I outputted from VueScan (slide scanning software). ![]() ![]() Please read carefully, and thanks in advance. I tried to recap and rephrase my issue below.
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