use -ping for more efficient IM identify #339
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identify with -format will get killed when attempted with higher resolution images. -ping will extract the image metadata with much less resource use.
Story
https://assaydepot.slack.com/archives/C030UPFBT2S/p1708949667556879
Expected Behavior Before Changes
Hi-res images created from big page PDFs e.g. https://sciencemuseumgroup.iro.bl.uk/concern/exhibition_items/02c65fab-9458-41c3-9120-435348d64681 will fail to create derivatives as identify command does not complete
Expected Behavior After Changes
Big PDFs and their Jpegs will get their derivatives again