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jackjohnbrown

Changing DPI breaks transparent background

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I have a png with a transparent background that I’ve imported into Designer on my iPad Pro. Original dpi was 150. I need to upload it to an online vendor that only accepts 300 dpi files. (I know.)

Changing the dpi in Designer only seems to work if I uncheck Embed Metadata in the Export screen — but when I do that and save as png, the resulting image has a white background. If I leave the setting checked, the background is transparent but the dpi remains listed as 150. 

Is it possible to change the dpi of the saved png to 300, but retain the transparency?

edit: I’ve discovered that I can make this work if I first create a 300 dpi document and then use Place Image to add my image. I can then turn off embed metadata and retain transparency. Still not sure why I can’t start with an existing png, though. 

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