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I was archiving some record album covers and I noticed an odd phenomenon. The album cover does not fit the bed of my scanner, so I was using two passes of the scanner, with a good deal of overlap, and using Photomerge to join the two images. Photomerge did a very nice job, but here’s where I noticed the oddity.
I’m scanning about 80% of the cover on each pass, so there’s quite a lot of duplicate data. Image1 was perhaps 18K in size and Image2 was about 15K. The total of the two images was about 33K. After I saved the Photomerged image the file size was somewhere about 55K. Where did the overhead come from?
Logically, I’d expect the final image to be way less than the sum of the two images and I think the duplicate data is being thrown away. Yes, I expect a file size bigger than the lager of the two files since some information is being added. Having the file size bigger than the sum of the two was unexpected.
The physical look of the merge was very nice, by the way. Since it is the image I’m interested in, not the file size, I’m not going to loose any sleep over this. I was just wondering if anyone else has noticed this.
Happy New Year to All!
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________________________________
Iraq is a Farsi phrase meaning Viet Nam
I’m scanning about 80% of the cover on each pass, so there’s quite a lot of duplicate data. Image1 was perhaps 18K in size and Image2 was about 15K. The total of the two images was about 33K. After I saved the Photomerged image the file size was somewhere about 55K. Where did the overhead come from?
Logically, I’d expect the final image to be way less than the sum of the two images and I think the duplicate data is being thrown away. Yes, I expect a file size bigger than the lager of the two files since some information is being added. Having the file size bigger than the sum of the two was unexpected.
The physical look of the merge was very nice, by the way. Since it is the image I’m interested in, not the file size, I’m not going to loose any sleep over this. I was just wondering if anyone else has noticed this.
Happy New Year to All!
—
________________________________
Iraq is a Farsi phrase meaning Viet Nam
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