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Photoshop Image Size Help  
User currently offlineTupolevTu154 From Germany, joined Aug 2004, 2178 posts, RR: 28
Posted (2 years 5 months 1 week 5 days 14 hours ago) and read 4724 times:

I recently had a photo usage request from someone who wants a print to hang up in their office.

He wants the photograph at a size of 60x90cm/23.6x35.4inch at a maximum. I've resized the photograph to 300dpi in photoshop to allow a print of this size, however it has given me a file size of over 9 gigabytes.

Obviously I can't attach a file size like that to an email (which is how we've been corresponding). I'm in need of a bit of help as to how big I should re-size this photo in photoshop and how I can send it to him via email. He's going to get it printed his end.

Many thanks in advance, and in case you were wondering, I haven't given it away for free!


Atheists - Winning since 33 A.D.
19 replies: All unread, jump to last
 
User currently offlinevikkyvik From United States of America, joined Jul 2003, 9805 posts, RR: 26
Reply 1, posted (2 years 5 months 1 week 5 days 13 hours ago) and read 4711 times:
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Quoting TupolevTu154 (Thread starter):
however it has given me a file size of over 9 gigabytes.

Whaaa????

That seems WAAAYYY to big for the size you have. At 300dpi, 23.6 x 35.4 equals 7080 x 10620 pixels, or about 75 megapixels. I'd guess that should be well under 100 megabytes, never mind gigabytes!

Given that a typical 1200 x 800 photo of mine is probably around 600-900 kilobytes, I'd assume a 75 megapixel file would be around 50-70 megabytes.

This all assumes you're working with JPEGs. If not, then never mind.  



"Two and a Half Men" was filmed in front of a live ostrich.
User currently offlinecaptainstefan From United States of America, joined May 2007, 426 posts, RR: 0
Reply 2, posted (2 years 5 months 1 week 5 days 13 hours ago) and read 4707 times:

With a file that size, your usual option would be to purchase file-sharing space on a site like dropbox.com . Or just mail him a USB drive containing the file. Those are the only ways I can think of.


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User currently offlinevikkyvik From United States of America, joined Jul 2003, 9805 posts, RR: 26
Reply 3, posted (2 years 5 months 1 week 5 days 12 hours ago) and read 4704 times:
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Quoting captainstefan (Reply 2):
With a file that size, your usual option would be to purchase file-sharing space on a site like dropbox.com . Or just mail him a USB drive containing the file. Those are the only ways I can think of.

You could also FTP it, if the customer has that ability.

Or you could probably upload it to Google Documents or something similar.



"Two and a Half Men" was filmed in front of a live ostrich.
User currently offlinelh526 From Germany, joined Aug 2000, 2353 posts, RR: 14
Reply 4, posted (2 years 5 months 1 week 5 days 11 hours ago) and read 4675 times:
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if it's for poster size, 150dpi is totally sufficient! 300dpi is for magazines and print with normal reading distance ... poster is for wall art best viewed some steps back, so 150dpi is totally enough cutting down your file size to a quarter of it's 300dpi size.


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User currently offlineckw From UK - England, joined Aug 2010, 730 posts, RR: 16
Reply 5, posted (2 years 5 months 1 week 5 days 8 hours ago) and read 4649 times:

Something very wrong there ... I just resized an image to the dimensions/resolution required - in 16bit - and produced a 431mb tif.

Changing that to an 8bit uncompressed jpg (which should be fine for most printing) results in 14.1 mb

So how you got 9gb is a bit odd - unless you have a large number of layers - if so flattening the image should do the trick.

The whole idea of up-sizing images to match a nominal target is a bit questionable. Firstly upsizing and printing at 300dpi is rather self defeating - you're not adding any detail, and probably introducing artifacts and smearing. I think most printing services with decent equipement will do a much better job of up-sizing the image as part of the print process

bottom line - a print at 150dpi will probably look better than one upressed to produce a nominal 300dpi at the same size. (for canvas prints or other 'special effects' you can get away with even lower resolutions).

The best idea, if possible, is to contact the printing company, and find out what they recommed to produce the required print.

Cheers,

Colin



Colin K. Work, Pixstel
User currently offlineTupolevTu154 From Germany, joined Aug 2004, 2178 posts, RR: 28
Reply 6, posted (2 years 5 months 1 week 3 days 20 hours ago) and read 4538 times:

Quoting vikkyvik (Reply 1):
This all assumes you're working with JPEGs. If not, then never mind.

I am working with JPEG, yes.

Quoting lh526 (Reply 4):
if it's for poster size, 150dpi is totally sufficient!

Even putting in 150dpi still shows a ludicrous file size.

Clearly I'm missing something, here's a screenshot of what the figures are when asking for 150dpi.

http://img.photobucket.com/albums/v476/Toml/screenshot.jpg

I just need step by step instructions on how to change an image size to one acceptable for printing in the dimensions above and how I can send it to him (preferably via email). I've not had to do this before and it's proving far more complicated than I had hoped! Thanks!



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User currently offlinedueckimages From Canada, joined Nov 2011, 4 posts, RR: 0
Reply 7, posted (2 years 5 months 1 week 3 days 19 hours ago) and read 4532 times:

Here's my stab after looking at the screen shot. I think that 9.36G is stating the number of pixels in the up-sized picture. As with previous posts, I have never come across a picture file size being that large. If someone can confirm that the 9.36G is the amount of pixels in the photo to be correct much appreciated and I am also open for correction if this is an incorrect assumption.

Cheers and Best of Luck


User currently offlineckw From UK - England, joined Aug 2010, 730 posts, RR: 16
Reply 8, posted (2 years 5 months 1 week 3 days 17 hours ago) and read 4520 times:

LOL - the files size is correct - it's your dimensions that are wrong ... if you look again I think you'll find the numbers are 10x what you intended (spotted that immediately as I've made the same mistake myself!)

Cheers,

Colin



Colin K. Work, Pixstel
User currently offlinelh526 From Germany, joined Aug 2000, 2353 posts, RR: 14
Reply 9, posted (2 years 5 months 1 week 3 days 17 hours ago) and read 4519 times:
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Quoting TupolevTu154 (Reply 6):
Clearly I'm missing something, here's a screenshot of what the figures are when asking for 150dpi.

According to your screenshot the final poster would be 12m by 9m large, well enough to cover an entire facade!

Quoting dueckimages (Reply 7):
Here's my stab after looking at the screen shot. I think that 9.36G is stating the number of pixels in the up-sized picture. As with previous posts, I have never come across a picture file size being that large. If someone can confirm that the 9.36G is the amount of pixels in the photo to be correct much appreciated and I am also open for correction if this is an incorrect assumption.

Check the bit depth of your photo and be aware that the size given in the image size box is the amount og Gig needed in the RAM to properly work with the file.



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User currently offlineflood From United States of America, joined Feb 2009, 1381 posts, RR: 1
Reply 10, posted (2 years 5 months 1 week 3 days 13 hours ago) and read 4497 times:

Quoting dueckimages (Reply 7):
I think that 9.36G is stating the number of pixels in the up-sized picture.

The 9.36G refers to document size, ie a 9.36 GB TIFF

Quoting lh526 (Reply 9):
According to your screenshot the final poster would be 12m by 9m large, well enough to cover an entire facade!

Indeed, from a modest 3.3 gigapixel image.

Quoting TupolevTu154 (Thread starter):

Going by the indicated ("was") document size of 26.7M, your original appears to be in the neighborhood of 3700px wide or a ~9mp image... that would roughly yield 100 pixels/inch.

As lh526 pointed out, 300 dpi is overkill for your needs. If you look up the various online printing houses, you'll find you exceed their minimum recommended resolution by quite a margin and the printer's software will upsize your image as needed anyway.

If you're wanting to do it yourself, I'd just double the dimensions using bicubic smoother (as selected method in the resize window) and send him the jpeg at max quality.


User currently offlinevikkyvik From United States of America, joined Jul 2003, 9805 posts, RR: 26
Reply 11, posted (2 years 5 months 1 week 3 days 13 hours ago) and read 4494 times:
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Quoting dueckimages (Reply 7):
If someone can confirm that the 9.36G is the amount of pixels in the photo to be correct much appreciated and I am also open for correction if this is an incorrect assumption.

From his screenshot, there are 3,348,654,736 pixels in the image (70868 x 47252), so around 3.35 gigapixels.



"Two and a Half Men" was filmed in front of a live ostrich.
User currently offlineTupolevTu154 From Germany, joined Aug 2004, 2178 posts, RR: 28
Reply 12, posted (2 years 5 months 1 week 2 days 18 hours ago) and read 4399 times:

Quoting flood (Reply 10):
If you're wanting to do it yourself, I'd just double the dimensions using bicubic smoother (as selected method in the resize window) and send him the jpeg at max quality.

That's what I've done, and it gives me these figures, with the image being 17MB;



Is that satisfactory?

Thanks for your help everyone!



Atheists - Winning since 33 A.D.
User currently offlinelh526 From Germany, joined Aug 2000, 2353 posts, RR: 14
Reply 13, posted (2 years 5 months 1 week 2 days 17 hours ago) and read 4389 times:
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Quoting TupolevTu154 (Reply 12):
Is that satisfactory?

If you provide your printer with that file he will print you a 24x16m large poster (larger than a house) at 8dpi ... that's certainly not what you want. Simply ignore the pixels, set resolution to 15dpi and change the width to your desired size, and as a reminder: 1m equals 100cm, not 1.000cm!



Trittst im Morgenrot daher, seh ich dich im Strahlenmeer ...
User currently onlineshufflemoomin From Denmark, joined Jun 2010, 471 posts, RR: 1
Reply 14, posted (2 years 5 months 1 week 2 days 14 hours ago) and read 4369 times:

I don't mean this comment to be offensive, but I recommend you read up on the very basics of image manipulation, especially if you plan on make a business of it.

If you're not actually printing the image for him, the dpi is completely irrelevant to you. Send him a max quality jpeg or TIFF if space allows at the images full resolution, leave the dpi at the default and let his printing service worry about dpi for his chosen print size. You don't need to do anything.

[Edited 2012-02-23 08:58:16]

User currently offlineckw From UK - England, joined Aug 2010, 730 posts, RR: 16
Reply 15, posted (2 years 5 months 1 week 2 days 14 hours ago) and read 4363 times:

Setting sizes can be confusing. Basically, the sizing box has two parts:

Top 2 values - there are pixel dimensions and are relevant to on screen sizes. If you want an image to be a given pixel dimension, you put the required values in here, and basically ignore the numbers which appear in the bottom 3 boxes - they're not relevant.

Bottom 3 values - these are the figures that determine the hard copy size and resolution. In your case, you would enter
60 cm
90 cm
and (suggested) 150 dpi

Don't worry about the numbers in the pixel boxes - PS will set these automatically to produce the print size/resolution you require. People get confused thinking they have to work with ALL the values. It's top section for screen, bottom section for print.

Cheers,

Colin



Colin K. Work, Pixstel
User currently offlineflood From United States of America, joined Feb 2009, 1381 posts, RR: 1
Reply 16, posted (2 years 5 months 1 week 2 days 10 hours ago) and read 4330 times:

Quoting lh526 (Reply 13):
If you provide your printer with that file he will print you a 24x16m large poster (larger than a house) at 8dpi ... that's certainly not what you want.

That's silly. Walk into any store or upload a file for printing and the first thing you're asked is what size you need. Any physical dimension data contained within the image, be it document size in inches/cm or the corresponsing DPI, is ignored.

Quoting TupolevTu154 (Reply 12):

Yes. I'm just curious how you ended up with 7.9 pixels/inch as merely upsizing an image by changing pixel dimensions in PS shouldn't affect that number. Keep in mind that repeated up/down-sizing will affect image quality. That said, if you've been experimenting on the image throughout this thread, you may want to take the original and upsize just once by changing width in pixel dimensions, with all 3 boxes ticked and using bicubic smoother.


User currently offlinelh526 From Germany, joined Aug 2000, 2353 posts, RR: 14
Reply 17, posted (2 years 5 months 1 week 2 days 6 hours ago) and read 4303 times:
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Quoting flood (Reply 16):
That's silly. Walk into any store or upload a file for printing and the first thing you're asked is what size you need. Any physical dimension data contained within the image, be it document size in inches/cm or the corresponsing DPI, is ignored.

For a normal photos lab that is true ... however a professional printer will always look for the physical dimensions of the TIFF or PDF file provided.



Trittst im Morgenrot daher, seh ich dich im Strahlenmeer ...
User currently offlineflood From United States of America, joined Feb 2009, 1381 posts, RR: 1
Reply 18, posted (2 years 5 months 1 week 1 day 21 hours ago) and read 4257 times:

Quoting lh526 (Reply 17):
however a professional printer will always look for the physical dimensions of the TIFF or PDF file provided.

I've never encountered the issue with various professional photo printers in the US. However, should he happen to select a printer who only reads metadata, it would be rather obvious beforehand as they won't bother asking for dimensions. Provided a printer asks or he tells them, he'll end up with the required size.


User currently offlinelh526 From Germany, joined Aug 2000, 2353 posts, RR: 14
Reply 19, posted (2 years 5 months 1 week 1 day 20 hours ago) and read 4250 times:
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Quoting flood (Reply 18):
I've never encountered the issue with various professional photo printers in the US. However, should he happen to select a printer who only reads metadata, it would be rather obvious beforehand as they won't bother asking for dimensions. Provided a printer asks or he tells them, he'll end up with the required size.

We are both correct: As I said ... photo printers / phot labs emphasize on the size you chose during order and ignore the metadata in the file ... professional offset printers and plotters however etc will mostly rely on the size given in the TIF or PDF file along with the dpi.

[Edited 2012-02-24 08:14:18]


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