Importing sharp images

I am scanning 35mm and 120 negs to print using TWAIN. On the one hand I
have to scan at a high resolution to get a sharp vivid image, but on
the other hand that makes the file size very large and it takes next to
forever to open or make changes to the image in photoshop. Does anyone
have a list of optimum dpi's for given sizes? The best print that
doesn't take more than a minute or two to open. What is the best way to
get sharp images using photoshop cs, an epson scanner, and an epson
printer?

DNT

Re: importing sharp images

If you are scanning film then you should ideally scan at the highest
resolution your scanner and cpu/ram can handle and archive this as your
digital negative.
You can then reduce the files size in CS to anything you want depending on
the use you will make of the image.
My personal recommendation is not to scan below 2400 dpi but higher is
better in the long run. I do not believe there is a real world benefit to
scanning at higher than 8 bit color depth but that is a matter of personal
choice as well as the limits of your system to handle the even larger files
sizes generated by scanning at higher color bit depths.
You may need to add more RAM to your system (1gb minimum) and have a second
hard drive to use for a swap/scratch drive for Photoshop to speed things up.
Also shut down any running background programs that are not needed as these
divert system resources.
The larger file sizes you bemoan actually make it much easier to retouch
scanned film with Photoshop without leaving obvious "Photoshopping" traces
in the image.


Bmoag

Re: importing sharp images

...
Hi.
The length of time taken by PS to perform an edit is dependant on the
Processor Speed, the amount of Ram, and the Read/Write Speed of your HDD,
and Scratch Disc HDDs if you have any. It also depends on how many edits
you have already done, and the number of history states the program is
remembering.
So the answer about time taken has to be, "it depends".
Scanning a 35mm frame at 2800Ppi should give a file large enough to make a
15 x 12 print, if it does not need much cropping.
That assumes you will be printing at 300Ppi, but depending on the content of
the image, you might be able to get away with printing at 240Ppi or perhaps
even as low as 200Ppi, so heavier cropping becomes possible. BUT you would
have to make that judgement on each Print.
You should also be aware that the Ppi figures given for Flat Bed Scanners
can be rather optimistic, when they are being used for Film.
Roy G


Roy G

Re: importing sharp images

...
Scan for a final uncompressed image size of 25 megabytes, 8 bits per
channel. In general an 8 megapixel, or 24 megabyte image is more than
adequate for an 8x10 inch print and will do well for a somewhat larger
print. Direct scans are not the best quality, so sharpen your images, and
color correct them for an even better final result.
If your intended print size is larger, and you find there is more detail in
the image, scan for a final print resolution of 320 pixels per inch.
--
Mike Russell
www.curvemeister.com/forum/


Mike Russell

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