gloss differential and bronzing effect

[younghoon_kil]

Hello,

Can anyone explain the difference between "gloss differential" and "bronzing effect"? I did

do a search on this but didn't find detailed answer. Could you please explain what the

basic difference between them?

 

Thank you for any reply.

[beauh44]

Hi younghoon, Once again, Google to the rescue. According to Royce Bair at http://www.bairarteditions.com/pages/mediagloss.html they are one in the same:

 

"One disadvantage of archival inkjet printing on glossy photo paper is the phenomenon called "bronzing," or "gloss differential." Gloss differential is what happens when light is directly reflected towards the viewer from off of the print.

 

The result is darkened, or "bronzed," reflections where ink has been laid, and full reflection (blown-out highlights) where little to no ink has been laid. This is a concern, but not a huge problem considering the fact the photographic prints aren't that much easier to distinguish from such an angle."

 

Hope this helps!

[jack paradise]

Bronzing is what is looks like. Can't mistake it. It does happen when using greyscale carbon pigments inks on glossy paper. The inks just sits on top of the paper (when dry) and when lighting hits it at certain angles, bronzing is revealed. Pretty ugly!

[mark_herring]

I'm a bit confused by one answer here...

 

The effect is fundamentally a variation in specular reflection for various densities. This causes the print to look different at different viewing angles. It is not the same for different paper/ink combos--ie sometimes DARK areas look light at certain angles

 

I was just sent some snaps printed on some kind of Kodak Printer. The effect is so bad, I wonder whey this printer was ever released.

[emre]

I gave some B&W prints with bronzing to my friends, touting it as a feature. They loved it ("How did you do that!?") It is all a matter of intention.

[younghoon_kil]

Thank you for all you gave me advices. ;-)