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Enhance postscript composition to support transparency in images

0 Kudos

Enhance postscript composition to support transparency in images

1. Describe your environment: What is your industry? What is your role in your organization? Describe your stakeholders.
Manufacturing


2. What product and version are you currently running?
Arbortext editor/PE 8.1.1.0

3. Describe the problem you are trying to solve. Please include detailed documentation such as screenshots, images or video.
When publishing to Postscript, pngs that are transparent are solid white  

4. What is the use case for your organization?
This happens when we publish See case PTC C16557219 

5. What business value would your suggestion represent for your organization?


6 Comments
olivierlp
Community Manager
Status changed to: Clarification Needed

Thank you @bfriesen for publishing your idea. However, you give very little info. You may simply add a comment to your idea with more details and context to better document your idea, Think about ways to educate and convince other Community members to support your idea and present your case to the product management team for consideration.

Please let us know within the next two weeks.

 

Here are a few examples of well documented ideas:

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Improve/fix the sheetmetal mirror feature - PTC Community

 

Enable object update for multiple workspaces - PTC Community

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Additionally, I invite you to check out this topic where PTC executives explain product managers' approach to customer ideas and input for product roadmaps.

bfriesen
16-Pearl

Quoting Brett Black

 

In ALD/APP, we pass PDFlib the PNG files as-is and that takes care of ensuring the transparency is obeyed. With PostScript, ALD/APP will convert the image to an internal format and then generate the PostScript information from that. During that internal conversion, transparent backgrounds are represented as white.
 
If you look here:

https://en.wikipedia.org/wiki/Transparency_(graphic)#Transparency_in_PostScript

You'll see that PostScript doesn't support transparency very well, but there are different methods to give that impression, such as clipping paths and masks.
 

Supporting transparency in PostScript output through APP would require an Enhancement Request.

GarethOakes
16-Pearl

APP/ALD will support clipping paths if that resolves your issue? If, instead, you mean true transparency support then that's a lot more involved. The problem is you have to layer all the images onto the page and resolve the percentage transparencies all the way down. Resolving is not trivial as you could have RGB images, CMYK images, named inks, colour spaces, etc. to contend with.

It might be easier to explore why you are having to print to PostScript, remove those issues, and then print direct to PDF which already supports transparencies.

I hope some of those information points and ideas are helpful.

olivierlp
Community Manager
Status changed to: Acknowledged

@bfriesen Based on the information you provided, we are acknowledging it as the Community management team. This is not a commitment from the Product team. Other users may comment and vote your idea up.

bfriesen
16-Pearl

This current issue showed up when we added a new PNG graphic to our cover. It looks great if we make a pdf. from editor and looks like a white box when we distill it. We can change the image to jpg but it then becomes pixelated when publishing.

 

The reason we postscript is that we have issues with huge pdfs. The pdf options out of editor do not compress the pdfs to same degree that distiller does. I have tried the suggested configuration files found in the help (CS213411). We even changed them to be exactly like the settings in Adobe. File size was still huge. We do have lots of cgm images in our manuals, We have been thinking about changing to svgs, but those seem to have issues also with clipping when you have models sticking over the hatched box in Isodraw.

 

Bryon

GarethOakes
16-Pearl

That's interesting! Perhaps the CGM issues should be their own enhancement request? I think you may have better luck getting the CGM and/or SVG issues fixed rather than PostScript transparencies? Just another idea.