Legacy ImageMagick Discussions Archive

jpeg compression splits an image into blocks of 8x8 pixels (a simplification which ignores chroma downsampling). The "best way to add a date stamp while minimizing loss of image quality" is to only recompress the blocks which were modified. ImageMagick, like most every image editor, lacks this ...

You can get some idea about the loss by just reading and writing the original JPG (without doing anything else) and use the compare function to get a measure of the change. convert image.jpg image_copy.jpg or convert image.jpg -density 100 image_copy.jpg Then compare -metric rmse image.jpg image ...

What formats are the input and output images? If JPG, then yes, because it is a lossy compression. Thus each time it is opened and saved it will lose some quality. If non-lossy compression is used in other formats (TIFF, PNG), then no as long as you keep the result as 32-bit or 24-bit color and not ...

I use the "convert" command in a script to add a subtle date stamp to my .jpg photos taken with my digital camera. Does this result in the loss of much image quality? If so, what is the best way to add a date stamp while minimizing loss of image quality? ${CONVERT} "$i" -font Arial -pointsize 48 ...