Jagged lines on some of my png images

[Gigatronix Pete]

Hey guys

We are creating a brochure & using 3D images of our products (connectors) created in Solidworks.

The main (attached image 1) image is a 3mb sized png & looks ok as it is, & once it's placed in it's position in Publisher (reduced right down) it still looks great.

The brochure when actually printed at 300dpi looks great but exported to pdf & uploaded online is not so good
The images are all linked rather than embedded & we exported the online brochure to pdf at 144dpi (85% image quality) to keep within our allowed maximum file size. 
Most of the images aren't too bad but this one in particular has very jaggy edges on the legs in the final pdf. (image 2)

We are at our online limit size wise so can't really increase the dpi or overall image quality when creating the pdf   ...does anyone have any ideas how to stop this jaggedness or at least improve it a little?

[Dan C]

Hi @Gigatronix Pete,

Sorry to see you're having trouble!

Could you please create a duplicate copy of your document, with this page of the brochure only - then attach a copy of this here, alongside a copy of the image in question?

If you'd like a private upload link for this file, please do let me know

Can you also please provide a screenshot of your export settings, including the 'More' options, so that I can replicate your setup here?

Many thanks in advance!

[Gigatronix Pete]

Hey @Dan C thanks for the reply & think i've done what you asked for here
The actual image is nearly 3 mb i hope that's ok altho I assume as the images are not embedded you won't be able to see the rest of the images on that page

12G-SDI-4K-Brochure-ENG_V2-test.afpub

[carl123]

I don't know what the official answer to your problem is but if you find the image in the Layers panel and rasterise it, then the PDF output is far less jaggy

[Gigatronix Pete]

Thanks for that @carl123 the image is in a frame & not embedded  ...will this still work?

 

[carl123]

Yes, you can rasterise the image or the frame and it should look better

Not sure why the original "image in the frame" is so jaggy, you may have to wait until Dan C has had a chance to look into that further

But if you are on a deadline try Rasterising it and see what you think 

[Dan C]

Thanks for your document and my apologies for the delayed reply here Pete!

I can certainly see this issue, and I believe it's happening due to the Rotation value applied to the image - as rasterising the layer resets the rotation value to 0, then when exporting this image comes out much cleaner.

I'm not 100% certain on the behaviour of Picture Frames with rotated contents and whether this is expected behaviour, so I'll forward this to our QA team and have them investigate further and find out for us

As soon as I've got more information for you, I'll be sure to provide it here - but I agree that rasterising the layer seems to be the quickest and easiest workaround for the time being!

[Pšenda]

34 minutes ago, Dan C said:

I can certainly see this issue, and I believe it's happening due to the Rotation value applied to the image - as rasterising the layer resets the rotation value to 0, then when exporting this image comes out much cleaner.

 

Unfortunately, the rotation of a vector object is often the cause of export problems.