CS5.5: Images in EPUB export appear blurry

Forum|Forum|8 years ago
April 26, 2017
3 replies
1844 views

I'm using CS5.5 to create EPUB from InDesign file. The file has several PNG and JPEG images that have 150 ppi and large enough resolution, but in the exported EPUB-file they seem blurry (mostly the text and fine lines) in Adobe Digital Editions. In export options I have selected 150 ppi and the conversion is PNG, image size is relative to page. What could cause the blurryness and what can I try to fix it?

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Willi Adelberger

Community Expert

Text and vectors in images or placed PDF/INDD files are always rasterized when exported as EPUB or Published Online. If InDesign could export them as SVG it could be avoided but this is not happening. You have to live with this limitation. The only resolution is at the moment to increase the object export resolution and only export PNG, not JPG. It would still rasterize the content but it would be less visible.

It has been improved in CS6 and later in CC 2015, but this is a limitation you have to live with.

I don't know, if some 3rd party developer has yet developed an export module with more capabilities, but I am not aware of it.

Steve Werner

Community Expert

Moving to InDesign EPUB forum

minnak67696179Author

Participant

And here is a picture of how it looks.

The picture is the table on the left. The text on the right seems fine, so the blurryness is only in the images.

Willi Adelberger

Community Expert

Additional: You have to consider that 150ppi is not high. If you want to make text and vectors look smooth on the screen, you have to work with a 4 times higher resolution than with images. That would be 1200ppi compared to 300ppi for a printed image. You have to expect blurry text and lines with only 150ppi.