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Downsizing to a specific MP?
Im having a problem with downsizing: when I do it in Lightroom or CS3, it's not - at least to me - readily apparent how many megapixels the downsized image will actually be. So, I bring up the calculator and do it manually, hehe. Does anyone know a better/faster way or am I just blind? Thanks!..

Comments (5)

Mikkel stergaard wrote:.

Im having a problem with downsizing: when I do it in Lightroom orCS3, it's not - at least to me - readily apparent how many megapixelsthe downsized image will actually be. So, I bring up the calculatorand do it manually, hehe. Does anyone know a better/faster way or ami just blind? Thanks!.

In Photoshop, the uncompressed image size is given alongside the 'Pixels dimensions' label in the Image Size dialog box..

I don't have Lightroom...

Comment #1

Steve Balcombe wrote:.

Mikkel stergaard wrote:.

Im having a problem with downsizing: when I do it in Lightroom orCS3, it's not - at least to me - readily apparent how many megapixelsthe downsized image will actually be. So, I bring up the calculatorand do it manually, hehe. Does anyone know a better/faster way or ami just blind? Thanks!.

In Photoshop, the uncompressed image size is given alongside the'Pixels dimensions' label in the Image Size dialog box..

I don't have Lightroom..

Thanks...but I still dont get it! For example, I have an image thats 2500x1712 pixels - thats 4,2 MP. The uncompressed size says 12,2M. How does these two numbers relate to one another?..

Comment #2

The two numbers aren't really related at all..

Image size in pixels, is determined by which sensor you have. Basic math says the number of pixels is equal to the height x width of the sensor, given in pixels as well. This is a constant, unless you tell the camera to record less than the maximum number of pixels..

File size, on the other hand, is not a constant. Each image will be slightly different in size, due to the compression settings in the camera..

The 12Mb number you are seeing is the size of the file AFTER the image has been decompressed for viewing..

So, are you trying to compress to maintain a certain file size limit, like 1Mb per image, or are you trying to resize the image itself, to a smaller pixel dimension? Or both??.

Crime Scene PhotographyA small gallery of personal work: http://picasaweb.google.com/PID885..

Comment #3

Hi, thanks for your response!.

Im not trying to reach a specific megabyte-size but only a specific megapixel-size, namely around 4 megapixels. In other words, I want to go from 12 megapixels to only 4, to help on slight blur and noise. Actual megabyte-size is not important...

Comment #4

Mikkel stergaard wrote:.

Thanks...but I still dont get it! For example, I have an image thats2500x1712 pixels - thats 4,2 MP. The uncompressed size says 12,2M.How does these two numbers relate to one another?.

The image uses one byte at each pixel for each of Red, Green and Blue. So the image requires three times as many bytes as there are pixels.Regards,Peter..

Comment #5

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This question was taken from a support group/message board and re-posted here so others can learn from it.

 

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