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changing photo resolution

Автор Сообщение
Mstolow
3 сообщений
Сообщение размещено07/08/2004, 13:28:35 PM Mstolow
I recently downloaded an image from dreamstime for the first time. Was wondering if it is possible to convert a 25 x 25 (72 dpi) to a 5 x 5 (300 dpi) for professional print?





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Ericsphotos
285 сообщений
Сообщение размещено07/08/2004, 14:03:56 PM Ericsphotos
You have much more than that. The image you downloaded is 1800x1800 at 300dpi resolution which gives you 6x6 print size if you want to keep it at 300 dpi.
Canon EOS 10D, several Canon and Sigma lenses. Epson Perfect...

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Mstolow
3 сообщений
Сообщение размещено07/08/2004, 14:59:22 PM Mstolow
So, if I import the JPEG into photoshop at its current size of 25x25 (72 DPI) and change the resultion to 300 and the size to 5x5, then I won't have a problem with image quality when going to print (offset)?


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Dana
224 сообщений
67
Сообщение отредактировано 07/08/2004, 16:35:04 PM Dana
Just make sure you have the "resample image" box unchecked when you change the dpi from 72 to 300. The size in inches will be adjusted automatically to 6"x6".

After that you can downsize your image to 5"x5".


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Achilles
4447 сообщений
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Сообщение размещено07/09/2004, 05:25:05 AM Achilles - - Администратор
Thread moved to DTP forum.


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Minpin
80 сообщений
<10
Сообщение размещено08/19/2004, 16:29:39 PM Minpin
I recently read a message about an article by John Setzler on

resolution. Apparently he had prepared it for presentation to a

class. For lack of enough time, I could read only a part of it, but

it was extremely interesting and I would like to download the entire text. Can anyone help with a link? I'd really appreciate it.
EOS Digital Rebel 300D EOS Rebel XTi 400D Lens: 75-...

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Lightpro
182 сообщений
Сообщение размещено08/19/2004, 17:40:20 PM Lightpro
go to : http://www.setzler.net . That is his website the last time I checked
Present Cameras; Nikon D-100, D-70 Lenses - Nikon 35-135,...

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Minpin
80 сообщений
<10
Сообщение размещено08/31/2004, 21:08:35 PM Minpin
Thanks, Lightpro, for j. seltzer's address. I found what I was looking for, printed it out, and am now trying to digest it. It's a

great article.
EOS Digital Rebel 300D EOS Rebel XTi 400D Lens: 75-...

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Lightpro
182 сообщений
Сообщение размещено08/31/2004, 22:35:22 PM Lightpro
No Problem, Glad I could help.
Present Cameras; Nikon D-100, D-70 Lenses - Nikon 35-135,...

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Themacgeek
1 сообщений
Сообщение размещено12/07/2006, 22:26:24 PM Themacgeek
For those interested, the following is an easy formula for determining photo resize dimensions. The information above regarding the de-selection of the "resample image" box in Photoshop is by far easier, but there are times when understanding how images are resized is important



1) Determine the line screen (lpi) of your final printed output. (Generally this is the line screen used by your service provider when outputting press plates.) Multiply that by (2). This is your target resolution.



2) Divide your target resolution by the resolution (ppi) of the native file. This is offset ratio.



3) Take the native file and divide any side (in inches) by the offset ratio.



The result is the maximum size of the photo on that side without image interpolation at your target resolution.



Example One: You have a camera photo sized at 29.667 inches x 39.556 inches at 72 ppi. In our example, we are preparing a photo for offset printing. Our service provider outputs their plates at 133 lines per inch. We multiply this figure by two and have 266 ppi as our target resolution. We then divide our target resolution by our native file format resolution. 266ppi divided by 72ppi returns an offset ration of 3.694. We can then divide our native photo dimensions by this ratio and this will give us the maximum size of the photo:



8.03 inches x 10.70 inches



Something that should be mentioned for versions 7 and 8 of Photoshop is the Auto Dialog that is found in the Image Size Dialog. This dialog performs step one in our process automatically and has three presets: Draft, Good and Best.



Depending on your output device, Best is the highest quality and generally used for printed items. It is recommended that you use Good for anything printed which is larger than a tabloid sheet (11x17) Generally, pushing the resolution beyond this setting will result in longer pre-press processing with no visible increase in quality.



Hope this has been helpful.

themacgeek

http://themacgeek.com





Current equipment includes a Nikon D80 and a Fuji F10.

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Markz
97 сообщений
78
Сообщение отредактировано 12/30/2006, 09:48:06 AM Markz
Just use 'Image Size' in photoshop (menu: Edit):

- mark 'Constrain Proportions',

- unmark 'Resample Image',

- fill in your preferred Width or Height



and see what Resolution does. For Press 300 dpi or more is perfect!.



Good luck

Mark
Canon Digital Rebel XT Canon EF-S 10-22mm f/3.5-4.5 Canon ...

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Rjssignscom
107 сообщений
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Сообщение размещено12/20/2007, 09:41:04 AM Rjssignscom
This is a good example of the phrase, 'The Devil is in the Details.' This is a very important detail for someone like me who always downloads high resolution images for print - a very large print !











Thanks for posting the topic.







Sherry
Nikon Coolpix 7600, Adobe Photoshop, Illustrator, FS - amon...

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Kandiekay
1 сообщений
Сообщение размещено01/27/2011, 19:30:22 PM Kandiekay
I am new at this. How do I know which size to download. Small, med, large, etc?


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Pastywhyte
31 сообщений
79
Сообщение размещено02/05/2011, 13:37:02 PM Pastywhyte
Kandiekay the easiest way is to determine the size to download, is to first ascertain how much resolution you need for your output. If I am designing for a website, I only need 72 dpi, wherease most print applications need 300. What this means is that if you broke the image down to just the number of pixels that create the image, you need 72 pixels to make up an inch of image on screen, but need almost 4x that much to print the same image without image loss (300 pixels in a inch). So the size and resolution are going to be greatly dependent on what you are planning to do. Many applications require different resolutions, and it is best to strictly adhere to those for best results..



A quick rule of thumb regarding resolution is that you can always lower the resolution and throw image data away if you dont need it, but once gone it can never be made larger again. This means that you never shrink your backed up image, and if you download something too small to begin with, you cant increase its size.



The best thing to do is what Mark suggested above



write your text hereJust use 'Image Size' in photoshop (menu: Edit):

- mark 'Constrain Proportions',

- unmark 'Resample Image',

- fill in your preferred Width or Height



and see what Resolution does. For Press 300 dpi or more is perfect!.


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