Created
June 21, 2020 16:44
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Calculate resolution while preserving the aspect ratio with 'fit' effect in python.
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| def get_scaled_resolution( | |
| self, | |
| old_width: int = None, | |
| old_height: int = None, | |
| new_width: int = None, | |
| new_height: int = None, | |
| ): | |
| """Returns the closest new resolution while preserving the aspect ratio. | |
| You can specify new width, height or both. | |
| It will automatically calculate the resolution. | |
| It can be used for both downscaling and upscaling. | |
| It will return either the same resolution you specified or bigger. | |
| """ | |
| if old_width is None or old_height is None or old_width < 1 or old_height < 1: | |
| raise ValueError("Old width and height must be int values bigger than 0") | |
| elif new_width is None and new_height is None: | |
| raise ValueError("You must specify width or height or both.") | |
| elif (new_width is not None and new_width < 1) or ( | |
| new_height is not None and new_height < 1 | |
| ): | |
| raise ValueError("New width and height must be int values bigger than 0") | |
| else: | |
| if new_height is None: | |
| height = int(old_height / (old_width / new_width)) | |
| width = int(old_width / (old_height / height)) | |
| else: | |
| width = int(old_width / (old_height / new_height)) | |
| height = int(old_height / (old_width / width)) | |
| if width < 1 or height < 1: | |
| raise ValueError( | |
| "Calculated resolution is too low - {0}x{1}.".format(width, height) | |
| ) | |
| elif new_width == -1 or new_width is None: | |
| return width, new_height | |
| elif new_height == -1 or new_height is None: | |
| return new_width, height | |
| elif width == new_width and height == new_height: | |
| return new_width, new_height | |
| elif width > new_width: | |
| return width, new_height | |
| else: | |
| return new_width, height |
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