Calculations with Optical Instruments
Image Size Calculation for Scale and Crop
A calculator for resizing (scaling and cropping) images and keeping the ratio. Enter width and height of the original image and one other value. Width and heigh can have any unit, like pixels (px), point, pica or millimeters, the result has the same unit. The percent values are always rounded to two decimal places.
Example: an image with 6000x4000 pixels, scaled to 40%, shrinks to 2400x1600 pixels. 3600 pixels in width and 2400 pixels in height have disappeared.
The original size and the new size have a rectangular format. The piece that has been removed or added is L-shaped, so it does not cover the entire specified length times width.
Common image formats for photographs are 13x9, 15x10 and 18x13. The measurement for these values is centimeters. If you want to convert centimeters to pixels, you can calculate with a factor of around 100, depending on the quality of the photograph. A photo of size 18x13 can therefore be converted to a format of 1800x1300 pixels. These three sizes for photographs all have different ratios, 1.44 for 13x9, 1.5 for 15x10 and 1.38 for 18x13.
Digital images can of course be of any size, depending on what they are used for. Photos are often presented in a 4:3 or 16:9 format. 4:3 or 1.33 have image sizes like 640x480, 800x600 and 1024x768. 16:9 or 1.78 have image sizes like 1280x720 and 1920x1080. These formats are also often found in the resolution of a monitor. 16:9 is a more elongated rectangle, 4:3 is more compact. The larger the image, the more common the elongated shape becomes. The field of view has a ratio of around 1.53, i.e. between these two image ratios. However, the human field of view is not symmetrical. Peripheral vision to the left and right is much more pronounced than up and down. There are also other practical reasons for the 16:9 format for large images.
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