scanning resolution

HH
Posted By
Harry Hayes
Oct 19, 2003
Views
462
Replies
8
Status
Closed
Hi
I scanned an old sepia photo about 4" x 3" – the intention being to enhance the image, remove blemishes and resize to almost double the original, whilst retaining as much detail as possible in the final print. I tried at 1200 dpi and after the resize ended up with about 100 mb. file I eventually rescanned at 500dpi and have about 22mb image file. What would be a reasonable scan resolution given the finished image size (about 7×5")
Harry


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franktlcc
Oct 19, 2003
300 dpi would print just fine.
TT
Tom Thackrey
Oct 19, 2003
On 19-Oct-2003, "Harry Hayes" wrote:

I scanned an old sepia photo about 4" x 3" – the intention being to enhance
the image, remove blemishes and resize to almost double the original, whilst
retaining as much detail as possible in the final print. I tried at 1200 dpi and after the resize ended up with about 100 mb. file I eventually rescanned at 500dpi and have about 22mb image file. What would be a reasonable scan resolution given the finished image size (about 7×5")

You want about 300 dpi to print so a 7×5 would be 2100×1500 pixels. Your original is 4×3 so scanning it to make 2100×1500 would be scanning at 525×500 dpi (2100/4 x 1500/3).

Your 500 dpi scan is just about right for a 5×7 print.

Some people, like me, like to edit at a higher resolution and then resize the image down for printing.


Tom Thackrey
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QK
Quinn Keleq
Oct 19, 2003
For a 4×3 to scan for print you need 300ppi so 1200×900 ppi dimensions. If you want to enlarge it to 7×5 you’ll need 2800×1500.

"Harry Hayes" wrote in message
Hi
I scanned an old sepia photo about 4" x 3" – the intention being to
enhance
the image, remove blemishes and resize to almost double the original,
whilst
retaining as much detail as possible in the final print. I tried at 1200 dpi and after the resize ended up with about 100 mb. file I eventually rescanned at 500dpi and have about 22mb image file. What would be a reasonable scan resolution given the finished image size (about 7×5")
Harry


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V
Voivod
Oct 19, 2003
On Sun, 19 Oct 2003 16:52:46 +0100, "Harry Hayes" scribbled:

I scanned an old sepia photo about 4" x 3" – the intention being to enhance the image, remove blemishes and resize to almost double the original, whilst retaining as much detail as possible in the final print.

Re-sizing up is a fools choice. Scan large, size down.
JW
Jim White
Oct 19, 2003
Try this site, Harry.
This is a calculator that will answer your question and the restof the site will teach you why!

http://www.scantips.com/calc.html

"Harry Hayes" wrote in message
Hi
I scanned an old sepia photo about 4" x 3" – the intention being to
enhance
the image, remove blemishes and resize to almost double the original,
whilst
retaining as much detail as possible in the final print. I tried at 1200 dpi and after the resize ended up with about 100 mb. file I eventually rescanned at 500dpi and have about 22mb image file. What would be a reasonable scan resolution given the finished image size (about 7×5")
Harry


Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.525 / Virus Database: 322 – Release Date: 09/10/2003
HH
Harry Hayes
Oct 19, 2003
I thank all those who replied, your advice most welcome. Harry


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HH
Harry Hayes
Oct 19, 2003
Re-sizing up is a fools choice. Scan large, size down.

Voivod
I’m not sure how I would go about doing this! – the original image is very old and is about 4"x3" – I have been asked to enlarge it to 7 x 5 appx, as far as I am aware the only control I have on the scanning process is to adjust the quality of the scan (dpi) and not the size?
Harry


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B
blue
Oct 20, 2003
On Sun, 19 Oct 2003 17:26:10 GMT, "Tom Thackrey" wrote:

On 19-Oct-2003, "Harry Hayes" wrote:

I scanned an old sepia photo about 4" x 3" – the intention being to enhance
the image, remove blemishes and resize to almost double the original, whilst
retaining as much detail as possible in the final print. I tried at 1200 dpi and after the resize ended up with about 100 mb. file I eventually rescanned at 500dpi and have about 22mb image file. What would be a reasonable scan resolution given the finished image size (about 7×5")

You want about 300 dpi to print so a 7×5 would be 2100×1500 pixels. Your original is 4×3 so scanning it to make 2100×1500 would be scanning at 525×500 dpi (2100/4 x 1500/3).

Your 500 dpi scan is just about right for a 5×7 print.

Some people, like me, like to edit at a higher resolution and then resize the image down for printing.

I second that. I’ve restored quite a number of old photos, using my ‘limited’ ability with PS and over time I’ve found scanning at 600, doing what I have to do with the pic and then resizing to 300 appears to give the best results. I’ve also had a couple of really bad pics that I’ve scanned at 1200 and then resized after fixes. The only problem on the later is the time it takes as you save each step, but the results were great.

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