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What format to Scan photo in to Restore

Jan 21, 2012, 19:16
Post: #1
What format to Scan photo in to Restore
I want to restore some photos, and I was wondering what format is the best for manipulation of the photo. My scanning options are: JPEG, TIFF, Bitmap, PNG, PCX, or Flash pix. My Output Resolutions are between 200 to 4800. I still have 532 GB free on my hard drive.
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Jan 21, 2012, 19:55
Post: #2
RE: What format to Scan photo in to Restore
High quality JPeg or TIFF. Scan them so that they are about 12MPix (4000x3000pixels). This gives enough pixels to work on, without requiring extraordinary amounts of CPU/RAM/Time to process.

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Jan 21, 2012, 20:03
Post: #3
RE: What format to Scan photo in to Restore
(Jan 21, 2012 19:55)ofnuts Wrote:  High quality JPeg or TIFF. Scan them so that they are about 12MPix (4000x3000pixels). This gives enough pixels to work on, without requiring extraordinary amounts of CPU/RAM/Time to process.

How do I get 12 MPix? How would I know what MPix, I have? I can scan up to 4800 Output Resolution, does that affect the MPix?
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Jan 21, 2012, 20:16
Post: #4
RE: What format to Scan photo in to Restore
Output resolution times physical size of photo equals size in pixels

So, scanned at 2000DPI a 4"x6" photo will produce at 8000x12000 pixels pictures, about 100MPix. You should now understand that if we want a fixed size in pixels, the resolution will depend on the input document, and old passport photos should be scanned with a higher definition that 4"x6" photos.

You can do a rough computation by considering that you want the bigger dimension to be about 4000 pixels, so if you have a 4"x6" photo, the 6" should give 4000 pixels, which means the picture should be scanned at 4000/6=667DPI but there is not need for perfect accuracy, you can use 600DPI (3600pixels) or 1000DPI (6000pixels). For a 1.5"x2" passport photo, you need 4000/2=2000DPI.

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Jan 21, 2012, 22:04
Post: #5
RE: What format to Scan photo in to Restore
If I am understanding you correctly my photo is 8.5X11 and if I do an output resolution of 200 I should get 3MPix that's 1700X2200; 300 would give me 8MPix that's 2550X3300; or 600 would give me 33 MPix that's 5100X6600. Does this look correct and would it be better to get 8 MPix over 33 MPix?
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Jan 21, 2012, 22:04
Post: #6
RE: What format to Scan photo in to Restore
If I am understanding you correctly my photo is 8.5X11 and if I do an output resolution of 200 I should get 3MPix that's 1700X2200; 300 would give me 8MPix that's 2550X3300; or 600 would give me 33 MPix that's 5100X6600. Does this look correct and would it be better to get 8 MPix over 33 MPix?
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Jan 22, 2012, 01:04
Post: #7
RE: What format to Scan photo in to Restore
You got it. 33Mpix is big. Of course it depends on your PC (CPU/RAM/Disk) but 600DPI is well above the definition of the original photo. 8Mpix is about OK.

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Jan 22, 2012, 02:25
Post: #8
RE: What format to Scan photo in to Restore
What would be the possible advantage and disadvantage using the 33 MPix?
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Jan 22, 2012, 10:18
Post: #9
RE: What format to Scan photo in to Restore
Might be worth noting, although these days probably will not affect the result.
Scanners have a have a hardware resolution and an interpolated resolution. So my old canon Lide30 scans at 1200x2400 but is quoted at up to 9600x9600 (interpolated)

Unless maybe scanning line-art there is no point going into the interpolated values.

To put it in perspective, a 6"x4" photo print scanned at 1200x1200 = 7200x4800 pix equivalent to a 34 Mpix camera. 600x600 scan equiv to a 8.6 Mpix camera.

Having done both in the past, IMHO 600x600 works, if you need to work on the pixel level, larger scans mean more work for no great benefit.

You also have to think about poor-old-gimp. Create a new 7200x4800 image and gimp will tell you that the image size in memory is 307.2 MB - not a happy gimp.

Image formats, as previous. Tiff is the traditional format, uncompressed or lossless, but why not jpeg just for the scan.

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