Image is blurred in generated pdf

[parag-bhole]

Hi, I am trying to create a pdf from html source, which has certain images loaded from URLs. Few png images of size 16x16 pixels are getting rendered blurred, while other images on page are looks fine. Please see the attached pdf and html files. In pdf images in "Priority" column in tables are not rendered properly. How can I fix this?
generated.pdf
from_html.html.txt

[danfickle]

Hi @parag-bhole

They certainly look blurry in the PDF. Could you upload a sample of the working image and non working image (I can’t download from localhost)? Thanks.

[parag-bhole]

Hi @danfickle
Thanks for checking out, please see attached here 2 images -
Working fine -
Blurred -

[danfickle]

I tested your two images with the file command on Mac. It turns out the non-working arrow is 16 bits per channel and PDFBOX doesn't like this. I think the easiest way would be to convert the 16bit image to a standard 8bit image. I did this with an online converter and upload it here for you.

file output:

issue-173-not-working.png: PNG image data, 16 x 16, 16-bit/color RGBA, non-interlaced
issue-173-working.png: PNG image data, 16 x 16, 8-bit/color RGBA, non-interlaced
issue-173-now-working.png: PNG image data, 16 x 16, 8-bit/color RGBA, non-interlaced

[parag-bhole]

Ok thanks @danfickle for the pointing out where the issue is. Unfortunately image comes from webapp we don't own and all we have is URL to include in html, so may be we will have to live with it.

[rototor]

FYI: I've created a patch and ticket for this upstream: https://issues.apache.org/jira/browse/PDFBOX-4184

In your case the alpha mask of the images is not correctly converted, the image looks broken because of that.

When you want pixelated images (i.e. without interpolation) we must set

	pdImage.setInterpolate(false);

on the image, so that it does not get blured. To do so we should add support for the image-rendering CSS property (see https://developer.mozilla.org/de/docs/Web/CSS/image-rendering). This does not work with all PDF reader, but at least Acrobat and the PDFBox Debugger render interpolate=false images correctly. (Mac Preview does not...)

[THausherr]

fixed in snapshot
https://repository.apache.org/content/groups/snapshots/org/apache/pdfbox/pdfbox-app/2.0.10-SNAPSHOT/