Change the colour of a PNG or PDF file to PMS

[HilcoWelding]

Hi there, 

I'm not an Illustrator pro. so after printing, I noticed a difference in colour. My green background is in a PMS colour and that PNG logo (with the transparent background colour) is not in PMS colour. I have the same problem with PDF logo's and PS files. All with transparent backgrounds.

I'm now trying to change the colour (white) of a png, ps or pdf file to a PMS colour. I'm not sure how to do this. See the image which shows the problem. It shows a different green (even though that needs to be transparent). Any help is appreciated. T.i.a. 

[SJRiegel]

Will you be printing with white ink? If not, then you should not use a Pantone color for white. While there are methods to deal with the issue you are seeing, if all of the logos you are placing are as simple as this one, the best route may be to re-draw them as vectors. 

[meganchi]

I would suggest finding a vector piece of art to use for your white symbol. No need to assign a Pantone color to the white symbol. You could easily redraw it using the polygon tool. Select the polygon tool and option + click on your canvas (alt + click for windows), set your number of sides to 3. Then click ok. Next, grab your direct select tool, then click on the triangle. You will see some dots appear along the corners. Select one of the dots and drag inward. This will round of the triangle edges. (If you don't see the dots, then go to Window menu and select "show corner widget". Now, find a font that has a similar explanation point, and size it in the center of the triangle.