I seem to be having a simple problem but have not seen it listed elsewhere on the form. I am new to my glowforge but have had no issues doing engraving/scoring/cutting for all use cases except photos. When I try to engrave a photo (I have tried many) they engrave a light image on the proof grade covering but do not engrave the underlying wood (proofgrade draftboard). I am using all of the default setting and setting the engraving to HD photo. I prepped the photo in photoshop and in each case have a high constrast photo that spreads through out the spectrum with a balance of black and white. Now I have a lot of light images on the proof grade coatings but no engraved wood. I did try once removing the proofgrade cover and engraving directly on the draftboard without the covering and in this case the photo actually looks pretty good–however I doubt that is how it is supposed to work.
Anything obvious I am doing wrong or should try next?