White/light areas around dark areas

[michiel_bernhard]

I have a problem with a batch of 900 prints I received from my local

photoshop.

 

When photographing a relative dark subject against a relative light

background I have a even more lighter area contouring the dark

subject. So I have for instance a dark tree in the center, a near-

white halo around it and than the lightblue sky.

 

Unfortunately I don't have the equipment to post an example.

 

Does anyone know what is happening here? I can't find the problem in

negatives, its only in the prints. It happens with a variaty of

lensens, I can't find it in older prints (from this and other

photoshops).

 

Please help.

 

Michiel, Holland

[jim schwaiger]

It sounded like diffraction initially, but this would be visible on the film (with a loupe). If there were a light source behind the tree, diffraction could cause this, but without an example image, I can't say for sure.

 

If the photoshop sharpened those images, it could be halos cause by too much unsharp masking as well. These are pretty common in the digital world, but I don't know how often they occur otherwise.

[steven_clark]

To me it sounds like an artifact of sharpening from a digital machine. That's the only thing I am familiar with that generates this kind of effect frequently.

[richard_roggow]

If the prints were made on a Frontier machine this is "Hypertone" at work. If hypertone is turned off the "halo" effect will no longer be present but the highlights will most likely blowout (ie. your light blue sky will appear white)