$begingroup$ Unless you have access to the 'ground' truth where you can actually separate the signal and the noise, and calculate statistics on that, this is an ill posed problem and there is no general solution to that, but only domain specific approaches. This is an 'active' (or at least open) field of research. There are a few data driven methods to determine SNR on a single image, that.
Calculate Ratio Image Size
Please enter your width and height to calculate aspect ratio
About Aspect Ratio
The aspect ratio of an image defines the proportion between its width and height. It is always expressed as two numbers separated by a colon (x:y). For example, images with the aspect ratio of 16:9, no matter how big or small, will always have the width of 16 and the height of 9 units of the same length. Therefore, 16 centimeters wide and 9 centimeters high image as well as 32 centimeters wide and 18 centimeters high image has the same 16:9 aspect ratio.
How to Use Our Calculator
In order to find out the aspect ratio of an image or video, both width and height should be known in advance. If you already have these two measurements just insert them into the calculator above and aspect ratio will be calculated as a result. All calculations are being made automatically to assure efficiency, accuracy, and fluidity!
- Formula to find Aspect Ratio: Aspect ratio=a/b Pixels=a.b where, a = Width of the image b = Height of the image Calculation of Aspect ratio and number of pixels in a dimensional image is made easier.
- Calculate the Aspect Ratio (ARC) here by entering your in pixel or ratio. Change the image aspect ratio via this Ratio Calculator. The pixel aspect calculator makes it extremely easy to change any 'W:H' format with custom a width or height.
Portrait vs. Landscape
Additionally our aspect ratio calculator will provide the mode for you picture or video. It will be determined based on the measurements provided. Mode for the images or videos which are taller than it is wide will be 'Portrait' and those with the bigger width than height will be 'Landscape'.
Other Important Details
Calculate Ratio Of 2 Numbers
Please note that measurements should always include ONLY the size of the actual image or video, and NOT to include additional video player dimensions or picture frames / borders. Sometimes video players or image frames could add up to 20 – 30 pixels and as a result aspect ratio will not be as it truly is.
You may also find useful other aspect ratio calculators: