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DPChallenge Forums >> Hardware and Software >> Raw Question - # of pixels
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Showing posts 1 - 9 of 9, (reverse)
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 05/08/2006 09:00:13 PM · #1
While editing in raw in photoshop I noticed that and Adobe RGB 1998 file in 8bit, 300dpi was showing a size of 6144x4085 (25.1MP).

How can this be? My D70 only is a 6.1 MP. Can anyone explain this?

Thanks,

Kenskid

Message edited by author 2006-05-08 21:02:32.
 05/08/2006 09:04:50 PM · #2
I Misunderstood

Message edited by author 2006-05-08 21:14:49.
 05/08/2006 09:08:10 PM · #3
I've heard of some software automatically interpolating the file size up to double the original -- I can't remember if it's an in-camera setting or in the RAW import program, but I'd check both.
 05/08/2006 09:10:10 PM · #4
In the photoshop raw converter there is a pull down menu that will interpolate your raw file to a larger size and the largest of those is 25.1 MP (6144by4085) maybe you accidently clicked this and that is while your file is so large.
 05/08/2006 09:10:44 PM · #5
should be about 18Mb. You have a 6mb file, but 3 channels (RGB). So unless maybe you're in CMYK mode?

When you converted from RAW did you set some setting to change this? In Canon's DPP i can set the DPI i want, but it doesn't change the pixel count.
 05/08/2006 09:12:32 PM · #6
In the RAW conversion window in PS, there's a little scroll-down menu called "Size" that lets you change the resolution...it really just interpolates the image up (or down) like GeneralE said. You may have accidentally hit it?
 05/08/2006 09:16:19 PM · #7
Yes...in the pulldown menu I have several choices ...the highest is 25mp. So this is sort of like a "software" conversion to a higher resolution picture?

BTW....on some of the files....it does not give me the option to choose anything abouve 6mp ?!?!?

KS

Originally posted by commendatori:
In the RAW conversion window in PS, there's a little scroll-down menu called "Size" that lets you change the resolution...it really just interpolates the image up (or down) like GeneralE said. You may have accidentally hit it?
03/14/2008 03:57:19 PM · #8
That's a great question I'd like to know also. Converting a RAW file for larger printing sizes; Will changing the DPI AND changing the Output size create a great file for printing? Or will this cause issues in the file? (haloing, artifacts, ect.) Or is this not needed for great large print?
 03/14/2008 04:58:10 PM · #9
Using the "Workflow Options" dialog and selecting a size other than the native size will do software resampling. When you open the list of available sizes, the ones that involve resampling have either a "-" or "+" sign next to them. Minus means size reduction, and plus means increased size.
You cannot create data, so increasing the size just gives a softer image.
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