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Well, just reread all the replies, thanks to eyerybody.
Just spent another few of hours on automated tools.
Autostitch is great, but it seems that I tend to get large barrel error, and has very high probability of running into the "out of memory" error.
Also it lacks lossless output, which is fatal for obsessive-compulsive perfectionist syndrome victims. (and in fact, saving unfiltered raws into jpeg sometimes do give you problems)
Microsoft ICE is also quite well, but sometimes I get jagged seams. It's ideal if it works, but if it doesn't, you can't do anything with it.
Hugin is highly customizable and nearly guaranteed to work-- as long as your raws are not distorted too seriously and you have enough time refining your control points. And you get numerical estimates for misalignments on different parts of your image in pixels. Compared with manual aligning and fixing, this software spreads distortion over the whole canvas instead of concentrating them to a few feature lines, which may give me some more peace of mind when stitching -_-||.
Also if your scanner's light is not quite uniform, its auto exposure levelling can save your ass.
But it's REALLY SLOW when computing output and has quite some weird behaviour-- sometimes you get stuck to some wrong output so save project often. Also, it takes quite a while to learn.
PS: according to a tutorial on using hugin to stitch flatbed scans, field of view angle can be set as you like, and the author used 40 degrees. But I think this angle should be set to a small value, like 1 deg. Because scanning is equivalent to a camera lens shooting from infinite far away from the scan.
kiowa
Just spent another few of hours on automated tools.
Autostitch is great, but it seems that I tend to get large barrel error, and has very high probability of running into the "out of memory" error.
Also it lacks lossless output, which is fatal for obsessive-compulsive perfectionist syndrome victims. (and in fact, saving unfiltered raws into jpeg sometimes do give you problems)
Microsoft ICE is also quite well, but sometimes I get jagged seams. It's ideal if it works, but if it doesn't, you can't do anything with it.
Hugin is highly customizable and nearly guaranteed to work-- as long as your raws are not distorted too seriously and you have enough time refining your control points. And you get numerical estimates for misalignments on different parts of your image in pixels. Compared with manual aligning and fixing, this software spreads distortion over the whole canvas instead of concentrating them to a few feature lines, which may give me some more peace of mind when stitching -_-||.
Also if your scanner's light is not quite uniform, its auto exposure levelling can save your ass.
But it's REALLY SLOW when computing output and has quite some weird behaviour-- sometimes you get stuck to some wrong output so save project often. Also, it takes quite a while to learn.
PS: according to a tutorial on using hugin to stitch flatbed scans, field of view angle can be set as you like, and the author used 40 degrees. But I think this angle should be set to a small value, like 1 deg. Because scanning is equivalent to a camera lens shooting from infinite far away from the scan.
I think I'll try manual ways tomorrow.
Ok, going to bed, it's 3am in my timezone...