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rubyminimagick

Make Multiple Copies From Original with image = MiniMagick

I need to generate several copies of an image in different formats/sizes. Can I do it without re-opening the source for each format/size?

Take this example:

# Original image is jpeg
image = MiniMagick::Image.open url
image.crop dimensions
image.format 'pdf'
upload image
# image = MiniMagick::Image.open url # No! Needless network traffic and processing.
image.format 'png'
image.resize new_size
upload image

This code is no good without the second #open because when image.format 'png' is called the image is a PDF, so I would end up rasterizing it, which is not what I want to do.

There's a method #clone, but it does not make a clone of the image object. Rather it sets a parameter for the converter. I can't figure out if this will somehow suit my purpose.

Solution

  • I found one way to do it, which seems fine.

    # Original image is jpeg
image = MiniMagick::Image.open url
image.crop dimensions

new_image = MiniMagick::Image.open image.tempfile.path

image.format 'pdf'
upload image

new_image.format 'png'
new_image.resize new_size
upload new_image

    Both the PDF and PNG will be cropped but each will only be converted once.