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What is Aspect Ratio?

wildbillnashwildbillnash Posts: 756
in Daz Studio Discussion

I've been playing around with Daz for a few years now and am slowly learning the different settings of the program. In the Render Setting tab, NVIDIA Iray, General section there are two settings I need to clarify. The Pixel Size is the size of the image (6"x9", 8"x11", ect.), that much i know. But what is the Aspect Ratio? What's it for?

Thanks in advance for any help.

Comments

  • 3WC3WC Posts: 1,107

    aspect ratio

    noun

    1. The width-to-height ratio of an image or of the area used to display an image. Most widescreen televisions have an aspect ratio of 16:9.
    2. The span-to-mean-chord ratio of an airfoil.
    3. The ratio of an object's longest dimension to its next-longest dimension.

    The American Heritage® Dictionary of the English Language, 5th Edition.

  • Richard HaseltineRichard Haseltine Posts: 100,778

    It's the ratio between width and height, usually the numbers will work out more neatly than just giving the size. It is mucg used for dispaly hardware - e.g. a tradtional CRT was usually 4:3, such as 1024 by 768 pixels, while widescreen may be 16:9 or 16:10 (e.g. 1920 by 1080 or 1920 by 1200). Aspect ration is the basic proportion, once chosen you can then enter a pixel dimension (horizontal or vertical) and DS will adjust the other dimention to peseve the ratio.

  • wildbillnashwildbillnash Posts: 756

    3WC, funny. Not what I was looking for but I liked it.

    Richard, thanks for the info. But isn't that the same as Pixel Size? For instance, I have a custom size of 3384x2466 Pixel Size and 188x137 Aspect Ration. Am I doing something wrong here?

  • crosswindcrosswind Posts: 6,926
    edited May 2023

    Pixel size defines the resolution of a render with 'absolute values' while Aspect Ratio defines a 'proportion' of Weight and Height with 'relative values'. In your case, the size of your render is subject to the absolute value of 3384 x 2466, while the Aspect Ratio could be 188 x 137, 18.8 x 13.7, or 1.370 x 1, etc...  Beside, Constrain Proportions (Global) toggles lock / unlock the ratio... If you turn it off, Aspect Ratio will be automatically calculated based on the values you enter into the fields of Pixel Size..

    Post edited by crosswind on
  • wildbillnashwildbillnash Posts: 756

    Okay, I don't fully understand but I'll play around with it some to see if I can. Thanks for the info, crosswind.

  • GordigGordig Posts: 10,049
    edited May 2023

    Aspect ratio tells you the shape of an image, while pixel dimensions tell you the size. If you set an aspect ratio, pixel dimensions are automatically adjusted to fit that ratio. For example, if your aspect ratio is 16:9, entering a width of 800 pixels will give you a height of 450, 1200 will give you 675, and so on. 1200x675 pixels is a larger image than 800x450, but they're the same aspect ratio. It's best to set your aspect ratio first, then set one dimension to automatically generate the other dimension.

    This post also reminded me that my brain really wants to add an N at the end of the word ratio every time I type it.

    Post edited by Gordig on
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