Can't read image file; unexpected problem for URI

[mapleLeat]

<img id="bgimg" src="file:///33.jpg" style="width:100%;height:100%;margin-top:0px;margin-left:0px;display:block;" />
''img'' tag failed to read picture, print warning.
In my test project, most pictures can be used normally.
But there are individual pictures that cannot be used. I don’t know why.

For example using this image will fail and issue a warning:
http://res.cloudinary.com/daifiltp4/image/upload/v1524278777/33.jpg

[danfickle]

Java can't natively read CMYK JPEGs. See:
https://stackoverflow.com/questions/41280021/cmyk-image-display-on-pdf-using-pdfbox

[mapleLeat]

@danfickle
Thank you for your comment!
Do you mean that I must first convert the picture to RGB format in order to use it normally?
The project I am developing is in the printing industry. It must be ensured that the PDF is generated in CMYK format.
Prior to this I used ITEXT to generate PDF, text and pictures are in CMYK format.
Is there any way to make it support the CMKY format?

[rototor]

@mapleLeat Sorry, but PDFBox (the replacement for iText OpenHtmlToPDF is using) does not support anything but sRGB at the moment. I plan to extend the org.apache.pdfbox.pdmodel.graphics.image.LosslessFactory of PDFBox to support extended colorspaces, bit-depths and CMYK. But I did not have the time yet to do so.

[THausherr]

PDFBox supports embedding of CMYK jpegs since June 2017.

[mapleLeat]

@rototor thanks,trouble you