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@ -638,7 +638,12 @@ def get_imgmetadata(imgdata, imgformat, default_dpi, colorspace, rawdata=None):
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ics = imgdata.mode
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if ics in ["LA", "PA", "RGBA"]:
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raise Exception("Image contains transparency which cannot be retained in PDF")
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logging.warn("Image contains transparency which cannot be retained in PDF.")
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logging.warn("img2pdf will not perform a lossy operation.")
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logging.warn("You can remove the alpha channel using imagemagick:")
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logging.warn(" $ convert input.png -background white -alpha remove -alpha off output.png")
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raise Exception("Refusing to work on images with alpha channel")
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# Since commit 07a96209597c5e8dfe785c757d7051ce67a980fb or release 4.1.0
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# Pillow retrieves the DPI from EXIF if it cannot find the DPI in the JPEG
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