Transparent Image Prints with Shadow No Matter What I Try

[Learning for All 180]

Hello,

I'm new to Photoshop and want to convert Stock images I have purchsed so that they are tansparent. I am a teacher looking to start selling materials I have created on Teachers Pay Teachers. I have learned how to delete the background of an image and also how to isolate an image from a background, save it in a new layer, and delete the original background. Everything looks great in Photoshop and on my screen (PowerPoint, Word). 

After I export my images and print them, the images are not truly transparent and a faint shadow box appears behind the image. What is driving my crazy is that sometimes some of the images print fine one moment and then when I do it again, the box shows up. It is so inconsistent and I can't figure out why. I have tried printing directly from Word, PowerPoint, printing/saving as a pdf, and the results are still inconsistent. I have printed several images one day that were fine, only to copy and paste them the next day into a new project and have them not be ok. 

I did a bunch of research on this subject and tried many of the suggestions from past threads, to no avail. I am attaching photos of all the combinations I have tried, with the accompanying results. I won't bother attaching screenshots, because everyting looks fine on the screen. It's just when I print.

Any suggestions or help would be highly appreciated. I am about to lose my mind and have spent umpteen hours trying to make this work. 

Maria

[G32807373o2qb]

I had this same problem and was able to resolve it. After finishing the document , you have to save the file as a JPG  high resolution prefered, and after doing so, print the file. This will blend all of the layers-properties and you won't be able to see the transparent box. Supposedly this happens because the PNG is in RGB format and the drawing is in CYMK (or viceversa), the JPG format unifies the file.