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Question

Photoshop Image Size - even numbers

Forum|Forum|2 months ago
November 17, 2025
4 replies
110 views

Hi there,

I am desperately trying to resize my Canon r5 images to "even" or "clean" numbers (pixels). The original format of the r5 is: 8192 x 5464 px (2x3 format). When I am in the "Image Size" Window typing for example 300 pixel (width), I will get 200 pixel (height), which makes absolutely sense because of the original sensor aspect ratio. BUT: When I type 3000 pixel for the long side (width), I suprisingly get 2001 pixel for the short side. WHY? I asume there is some hidden decimal place going on in the background?!? I remember there was no issue with my old Canon 5D Mark IV (6720 x 4480 px). Is there any workaround?

Any help would be greatly appreciated.

Thanks and best regards!

macOS

W

wolf_paradeAuthor

Participating Frequently

Hi there,

thanks so much for all the quick and helpful replies. I already was assuming that it will have to to with decimal places and rounding.

Best regards!

E

ExUSA

Genius

If you look at specs for many cameras, actual and effective pixels are often different.

Canon lists the R5 as "Effective pixels approx 45.0 megapixels, Total pixels 47.1 megapixels"

Also, when you scale images, Photoshop sometimes does a bit of rounding, especially with multiple changes.

D Fosse

Community Expert

@ExUSA

It's pretty simple, actually. When you open a raw file, you get that many pixels wide by that many pixels high. That's the resolution.

L

LAMY2017

Legend

Math, ugh, what's it good for HUH (apologies to the band WAR)

8192 ÷ 5464 px = 1.49926794, not 1.5 <-- the source of the rounding error?

Or perhaps that the dimensions of the image and the dimensions of the display are involved/different?

My MacAir display's dimensions are 1024x640 . . .1440x900 . . . 2560x1600 -- a ratio of 1.6:1.

[theory failure? 800x600 = 1.333333]

Larry

D Fosse

Community Expert

Yes, as I said, it's almost never a perfect 3:2. Sticking to your 3000 pixels long side, you may get 3000x2002, 3000x1999, etc. I've had a large number of Nikons and Sonys over the years, and I don't think I've ever seen a perfect 3000x2000.

Your display is irrelevant here. This is about the camera sensor pixels.

D Fosse

Community Expert

This is just the sensor's actual aspect ratio (it's almost never a clean 3:2).

3000 x 2001 becomes 300 x 200 simply because of rounding. You can't divide a pixel.

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