Understanding Aspect Ratio for Printing – Photoshop Video Tutorials

Has this ever happened to you? You bring your digital images to the print lab and ask for 5 x 7 prints and when you compare them to you original photo files, you have parts cropped out? Now why is that? Did the lab screw up?

Basically, the aspect ratio of your original image isn’t the same as the aspect ratio of the print. Ok, before I go any further, let me explain “aspect ratio”. Aspect ratio is a measurement of the proportion of your image. The largest side divided by the smallest side of your image will give you your aspect ratio. For example, my D300 images are 4288 x 2848 which is an aspect ratio of 1.5:1 (my long side is 1.5 times longer than my short side). Of course, we humans don’t like decimals so we multiply the aspect ratio until we get full numbers. So my 1.5:1 ratio will become 3:2. Personally, I prefer seeing all my aspect ratios on a :1 base but that’s just me. 🙂

Let’s look at the standard print sizes and their aspect ratios. I’ve put the :1 ratio in brackets.

– 4 x 6 = 3:2 (1.5:1)
– 5 x 7 = 7:5 (1.4:1)
– 8 x 10 = 5:4 (1.25:1)
You can view a complete ratio table over at DPC Prints.

Now you can see if your original image has an aspect ratio of 3:2 and you asked for a 5 x 7, that part of your image will be cropped out at the lab; even worse if you get an 8 x 10. Here’s and example.

Now that you understand aspect ratio, you can now prepare your images accordingly in Photoshop so that you have total control of where the image is cropped. Video time!  🙂

Recommended Books:
Adobe Photoshop CS4 Classroom in a Book
The Adobe Photoshop CS4 Book for Digital Photographers

[vimeo 2496043] [youtube Ud7v_NYp6hY]

3 responses on "Understanding Aspect Ratio for Printing - Photoshop Video Tutorials"

  1. It’s unfortunate there is differences in sizes/aspect ratios, especially between the digital image and the standard 8X10/11X14 etc. mats and frames. Frustrating having to cut off parts of images sometimes!

  2. Another easy to use software is MS Office Picture Manager.

    It has a function under edit, crop, where you can choose the aspect ratio or size of your print – in then crops the photo – but lets the user play with the cropped positioning (so you can manage what is going to get cropped.

  3. Cool! I learned the hard way about aspect ratios a couple of years ago 😛

    Sometimes I want to make sure I cut the same number of pixels off each side to keep the crop dead centre, so (with the help of a calculator) I adjust the canvas size instead, which means Photoshop can centre the crop for me.

    Perhaps that’s a bit of a lame way to do it.. but it’s handy sometimes!

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