OT – resolution / size

L
Posted By
L._Kota
Jan 21, 2009
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594
Replies
15
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Closed
I would like to know what I could expect as far as printing goes if I have a CD with images cropped at 4×5 with a resolution of 1000?

If images are "cropped at 4×5" would you interpret this to mean they are 800×1000 pixels?

Would this be enough resolution to print a photo 16×20?

Thanks so much …
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BL
Bob Levine
Jan 21, 2009
Not enough info.

4×5 what? inches, millimeters, centimeters?

Printed how? High end press, low end ink jet?

Bob
RK
Rob_Keijzer
Jan 21, 2009

L.

You have to get your terminology right. 1000 is not a resolution. 300 pixels per inch would be.

If your image is 1000 pixels wide, then printing at 300 ppi would make your images a little over 3 inches.

Remember: images have a pixel size, for instance 3000 x 2000 pixels. Resolution is "tagged" to the image as a print instruction. With that determined it also has a print size.

Rob
BC
Bart_Cross
Jan 21, 2009
I think it means that the jpgs are 1000ppi at 4×5, so the images would be 4000×5000 which means you can easily print them at 12×15 @ 300ppi, on an inkjet it could be larger.
P
Phosphor
Jan 21, 2009
Linked below, a primer on resolution that should explain everything, so long as you read and think carefully. Bookmark it, and then start at *START.

<http://www.scantips.com>
L
L._Kota
Jan 21, 2009
Thank you all, very much. I will get back with the photographer and get more information. Your help is appreciated.

wrote in message
I would like to know what I could expect as far as printing goes if I have a CD with images cropped at 4×5 with a resolution of 1000?
If images are "cropped at 4×5" would you interpret this to mean they are 800×1000 pixels?

Would this be enough resolution to print a photo 16×20?

Thanks so much …
L
L._Kota
Jan 21, 2009
I composed a message with all of your valuable information and this (below) is the response from the photographer:

"All of the images are 4×5 with a resolution (dpi) of 1000. This means that you may still enlarge the images as long as the resolution remains 1000. We save all of our images this way because we crop them as 4x5s. Since the resolution is so high you are able to enlarge the images to a 16×20 without an issue. We do this all the time for the past 8 years! So I know it works fine.

You only need a resolution of 300 compared with the size. This means that you can enlarge the image to a 16×20 which lowers the resolution to 300. It is something of a math equation. We use photoshop & it does show it as being a 1000 resolution when I preview the image. I am not sure why you do not think that 1000 is not a resolution. Another way of looking at it would be dpi. The 4×5 is inches."

Your input will be appreciated …
Thanks,
Linda

wrote in message
Thank you all, very much. I will get back with the photographer and get more information. Your help is appreciated.

wrote in message
I would like to know what I could expect as far as printing goes if I have a CD with images cropped at 4×5 with a resolution of 1000?
If images are "cropped at 4×5" would you interpret this to mean they are 800×1000 pixels?

Would this be enough resolution to print a photo 16×20?

Thanks so much …

P
Phosphor
Jan 21, 2009
"This means that you can enlarge the image to a 16×20 which lowers the resolution to 300. It is something of a math equation."

She better double check her math.

Seriously, L. Kota…Go to the link I provided above. Learn for yourself how to understand resolution. That way you won’t have to take the word of someone who is not as accurate as they should be, and not very good at explaining in plain English what you need to know. Don’t depend on someone like that, or anyone else. You’ll be better off.

Oh, and could you please turn off the Auto-Quote feature on your newsreader client? It’s kind of frowned upon in these forums. If you need to quote a previous reply, please do so manually, and jusdiciously.

Thanks!
P
PeterK.
Jan 21, 2009
Enlarging to 16×20 inches would give a resolution no greater than 250ppi.

And 1000 is not a resolution. 1000 pixels per inch is. 1000 pixels per centimeter is. When talking about print, size and resolution should be specified.
R
Rothrock
Jan 21, 2009
For example 1000 is not a distance or a speed, it is only a number.

1000 miles is a distance, but not a speed.

1000 miles per hour is a speed.

To be a resolution you need a number with some units and the all important "per" some other unit.

300 pixels per inch is great for printing.

300 pixels per mile is not so great for printing.

Likewise 4 x 5 is not a size. 4 x 5 inches or 4 x 5 centimeters is a size.

Very often people who do this stuff day in and day out drop the units in their own internal discussions. But when trying to straighten out issues or starting up fresh communications with new people it is critical to be sure that everyone is using the same units, or at least knows what units are being used and is able to convert from one to the other.
DM
Don_McCahill
Jan 21, 2009
Lets be fair here, the revised post did specify the resolution at 1000 dpi, which is close to correct (should be ppi).

And while the photog’s math is not great 1000/4=300, it basically is true that you will get a fairly sharp 16×20 at 250 ppi.

if images are "cropped at 4×5" would you interpret this to mean they are 800×1000 pixels?

I would take this to mean that the images are 4000 x 5000 pixels.
L
L._Kota
Jan 21, 2009
Thank you so much for answering my questions.

I do find www.scantips.com and very useful resource but it will take me a bit of studying to wrap my mind around all of the information there.

Thanks again.
L. Kota
P
Phosphor
Jan 21, 2009
The REAL point is that learning to understand resolution and how to calculate and apply the concepts to ones work in digital imagery is analogous to learning grammar and the rules of writing if you want to be a writer.

It’s just part of the program. You can either guess, fumble, and be dependent upon the help of others, or you can just knuckle down and learn it for yourself. It’s NOT that hard.
P
Phosphor
Jan 21, 2009
Yep…Scantips is pretty thick with info. Take your time and keep going back to it.

When the light finally goes on above your head, you’ll understand as naturally as you sign your name.
BC
Bart_Cross
Jan 22, 2009
Nobody reads post #3 either.
L
L._Kota
Jan 22, 2009
Thank you so much for a link to such a valuable resource. The help and information shared in this forum is very much appreciated. I have a clear understanding now of the correlation between ppi and size. Thanks!

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