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downsizing

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  #1  
Old 11-21-2012, 04:38 AM
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jarulex jarulex is offline
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downsizing

Hello Folks!
I wish to downsize my pics from 5616X3744 px-12,5"x18,7"-60Mb Raw format to 9,1"x11,8" TIFF (or other suggested format), so I'll be glad from you to receive some suggestion about the best process to follow, in order of obtain the best quality reachable.
In facts I could resize and resample to 300 ppi (about 27 Mb) or leaving more or less the same weight resize to 475 ppi (69 Mb).
Thanks for any suggestion.
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Old 11-21-2012, 11:03 AM
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DannyRaphael DannyRaphael is offline
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Re: downsizing

If you have Photoshop CS one approach would be to:
1. Record a 1-step photoshop action where you record the desired size and resolution values
2. Then invoke this action using File > Scripts > Image processor where you can specify:
* The source folder
* The destination folder
* Output format (.tif)
* The action recorded above

I hope this helps you get started.

Note: If you do not have Photoshop what editing program(s) do you use?
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Old 11-21-2012, 11:35 AM
Flashtones Flashtones is offline
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Re: downsizing

Chances are your raw processor can do this upon export.
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Old 11-21-2012, 11:37 PM
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jarulex jarulex is offline
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Re: downsizing

I'm using Photoshop.
My problem is to preserve the quality of the image.
Should I save all the pixels (5616X3744 px-12,5"x18,7"-60Mb Raw format) which, resizing, gives me a resolution of 475 ppi, or resample to 300 ppi?
An other interesting option (as said by Flashtones) is to resize and possibly resample in Camera Raw before opening Photoshop. This gives me some advantage?
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Old 11-22-2012, 01:05 AM
RobertAsh RobertAsh is offline
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Re: downsizing

An excellent way to shrink an image and preserve quality is in Photoshop:
  1. Image > Image Size
  2. Type in the resolution you want into the Resolution field
    • Note: Set your Resolution first. If you set the width and height first, then they will change again when you set the resolution later.
  3. Type in the width (or height) you want the image in pixels, inches or centimeters
  4. Select Bicubic Sharper from the bottom drop list
  5. Leave Scale Styles, Constrain Proportions and Resample Image checked
  6. Click the OK button
You can record this as an action and run a batch process or a script if you want to process many images the same way.

Last edited by RobertAsh; 11-22-2012 at 01:12 AM.
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Old 11-23-2012, 11:57 PM
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Re: downsizing

Thanks you all.
My present doubt: 'is really helpful to save the all the pixels I got shooting Raw, which for a 9"X12" document will give me 475 ppi, or resample to 'just' 300 ppi?
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Old 11-24-2012, 02:34 PM
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Re: downsizing

Quote:
Originally Posted by jarulex View Post
I'm using Photoshop. This gives me some advantage?
Depends on the raw converter. If you're using an Adobe converter (ACR or Lightroom), the resampling is a bit better than Photoshop. It's adaptive and you don't have to select what algorithm to use if you size up or down. The engine is smart enough to do this for you. Far less flexibility in Adobe Camera Raw (only a small group of sizes to select). Lightroom gives you all the tools to size anyway you wish.
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Old 11-24-2012, 03:10 PM
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andrewrodney andrewrodney is offline
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Re: downsizing

Quote:
Originally Posted by jarulex View Post
Thanks you all.
My present doubt: 'is really helpful to save the all the pixels I got shooting Raw, which for a 9"X12" document will give me 475 ppi, or resample to 'just' 300 ppi?
YES! Assuming you might end up retouching or working on the image and it might be output a larger size in the future.
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