Can you share a (problem PDF) file on a public web site? What do the makers of the design software say?
I sent an email to the Canvas techs to see if there is any idea. I don't know that it's an issue with them, since many other programs read them, but I don't know for sure. You can open them in Chrome or even the Windows preview. I have not heard back from them yet. Here are links to 2 files:
The dark green on the first one is RGB 0-142-0, which is a standard selection from the default palette. The lighter green is RGB 128-199-128, which is the equivalent of the dark green at 50% opacity. Regardless, if I change each of the light green to any other standard color (RGB 255-199-255 Pink, for example), the file will open in Acrobat.
The PDF file is certainly wrong. Some apps may take a stab at showing you something.
The file being wrong is the fault of Canvas, but it can probably be stopped if you change how you set up the colour. Are you trying to set up an RGB colour or a spot colour? Because you have a spot colour called "No name", with a RGB alternate space (nobody EVER does that) but CMYK alternate values.
Thank you so much! I just learned the same thing from the Canvas tech. There was a problem with how Canvas exported PDF's in my version, which has been corrected in the upgrade.
I need colors that are not in the default palette, but I suppose they don’t need to be spot colors. I’m not sure exactly what a spot color means or what it does. However, I was able to clear the “spot color” check box and remove the color name on each one of the light green objects, retaining only the same RGB settings of 128-199-128. I saved the PDF afterwards, and it now opens fine in Acrobat.
I am grateful for your help. Could you please briefly explain what a “spot color” is and why it would be used?
A spot colour has just one job. In professional printing (generally on a press, occasionally on a digital printer), it's a special ink. Not just a special colour you want, but an ink someone will mix in a bucket. It's usually used for gold, bright colours, that sort of thing. So don't use it if you just want a private colour. There's nothing at all unusual about working with colours outside the default palettes, they are still RGB. Glad to hear Canvas fixed it too.
The key reason to avoid spot colours is that you may end up getting billed for extra buckets of ink at a very high charge !
Thank you for your help! From now on, I will remember not to use the spot color box until I upgrade the program, at which point it will no longer be an issue.