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问题:
I'm trying to convert a fetched image from JPG to PNG using RMagick, resize it and then store it on S3:
thumb = Magick::Image.read("artist.jpg").first thumb.write("artist.png") thumb.crop_resized!(120, 120, Magick::CenterGravity) AWS::S3::S3Object.store("image.png", thumb.to_blob, AWS_BUCKET, :content_type => 'image/png', :access => :public_read)
The image does get saved as a png but when I open it in Preview, document type still says "JPEG image". In fact, the image won't even open in Photoshop unless I change the extension back to ".jpg". Am I missing something?
回答1:
Try explicitly setting the format:
thumb = Magick::Image.read("artist.jpg").first thumb.format = "PNG" thumb.write("artist.png") thumb.crop_resized!(120, 120, Magick::CenterGravity) AWS::S3::S3Object.store("image.png", thumb.to_blob, AWS_BUCKET, :content_type => 'image/png', :access => :public_read)
回答2:
For me, doing thumb.format = "PNG" didn't work, however doing thumb.format('png') does work. Most likely due to changes in the past few years.
thumb = Magick::Image.read("artist.jpg").first thumb.format("png") thumb.crop_resized!(120, 120, Magick::CenterGravity) AWS::S3::S3Object.store("image.png", thumb.to_blob, AWS_BUCKET, :content_type => 'image/png', :access => :public_read)
Hope that helps.
