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I'm a photography noob so try not to flame my ass too much.

I recently purchased a Fuji S700 and noticed that when I take pictures
in the shade, and the sky is really bright, the light from the trees
above can show purple fringes in the extreme edges. I have a few
questions on how to minimize this problem.

- Would buying a UV or polarizing filter help cut down on the
fringing?
- Should I just use Photoshop and remove it using software?

I got a super deal on the camera and I can live the the purple
fringing. It only happens when there is a huge difference in the light
balance between where I am taking the shot and the back ground.
Compared to my old camera, this one should make it a few years.

Cheers,

Stoneman

Stoneman wrote:
> I'm a photography noob so try not to flame my ass too much.
>
> I recently purchased a Fuji S700 and noticed that when I take pictures
> in the shade, and the sky is really bright, the light from the trees
> above can show purple fringes in the extreme edges. I have a few
> questions on how to minimize this problem.
>
> - Would buying a UV or polarizing filter help cut down on the
> fringing?
> - Should I just use Photoshop and remove it using software?
>
> I got a super deal on the camera and I can live the the purple
> fringing. It only happens when there is a huge difference in the light
> balance between where I am taking the shot and the back ground.
> Compared to my old camera, this one should make it a few years.

I had, well still do have, a Sony F828 which also has a lot of purple
fringing. Most of the time I just left it in the photo, people rarely
notice it in a print. When I wanted to get rid of it I would selected
and de-saturate it with maybe just a bit of darkening.

I never had luck with UV filters, a polarizing filter might help a bit
in that it will sometime darken the sky. Note that it has to be a clear
day and the sun has to be at the right angle to get much benefit from this.

Scott

On Oct 11, 12:05 pm, Stoneman <1chrisst...@gmail.com> wrote:
> I'm a photography noob so try not to flame my ass too much.
>
> I recently purchased a Fuji S700 and noticed that when I take pictures
> in the shade, and the sky is really bright, the light from the trees
> above can show purple fringes in the extreme edges. I have a few
> questions on how to minimize this problem.
>
> - Would buying a UV or polarizing filter help cut down on the
> fringing?
> - Should I just use Photoshop and remove it using software?
>
> I got a super deal on the camera and I can live the the purple
> fringing. It only happens when there is a huge difference in the light
> balance between where I am taking the shot and the back ground.
> Compared to my old camera, this one should make it a few years.
>
> Cheers,
>
> Stoneman

The purple fringe you see isn't really just fringe. The purple colour
is diffused across the whole image. It is the defocused blue and red
light cause by the lens not being able bring all colours to a single
focus point. You can use PS or PSP, whatever and remove the purple
glow as long as it isn't too bad or doesn't bleed directly into the
object it surrounds. If you are forced to remove a lot of it, you can
see all the image's colour change. The net result of the light being
diffused across the whole image is a reduction in image contrast.

On Oct 11, 2:03 pm, Rich <rander3...@gmail.com> wrote:
> On Oct 11, 12:05 pm, Stoneman <1chrisst...@gmail.com> wrote:
>
>
>
> > I'm a photography noob so try not to flame my ass too much.
>
> > I recently purchased a Fuji S700 and noticed that when I take pictures
> > in the shade, and the sky is really bright, the light from the trees
> > above can show purple fringes in the extreme edges. I have a few
> > questions on how to minimize this problem.
>
> > - Would buying a UV or polarizing filter help cut down on the
> > fringing?
> > - Should I just use Photoshop and remove it using software?
>
> > I got a super deal on the camera and I can live the the purple
> > fringing. It only happens when there is a huge difference in the light
> > balance between where I am taking the shot and the back ground.
> > Compared to my old camera, this one should make it a few years.
>
> > Cheers,
>
> > Stoneman
>
> The purple fringe you see isn't really just fringe. The purple colour
> is diffused across the whole image. It is the defocused blue and red
> light cause by the lens not being able bring all colours to a single
> focus point. You can use PS or PSP, whatever and remove the purple
> glow as long as it isn't too bad or doesn't bleed directly into the
> object it surrounds. If you are forced to remove a lot of it, you can
> see all the image's colour change. The net result of the light being
> diffused across the whole image is a reduction in image contrast.

Thanks for the responses everyone. I am going to experiment a bit with
the camera and maybe get a filter or two. The filter will also help me
protect the lens when the camera is in use.

-S

Stoneman <> wrote:
>I'm a photography noob so try not to flame my ass too much.

Good question, though.

>I recently purchased a Fuji S700 and noticed that when I take pictures
>in the shade, and the sky is really bright, the light from the trees
>above can show purple fringes in the extreme edges. I have a few
>questions on how to minimize this problem.
>
>- Would buying a UV or polarizing filter help cut down on the
>fringing?

Nope.

>- Should I just use Photoshop and remove it using software?

Yep.

The fringing is inherent in the lens. It comes from lenses acting
sort of like prisms and separating out the colors of light. Even
expensive lenses can show it.

>I got a super deal on the camera and I can live the the purple
>fringing. It only happens when there is a huge difference in the light
>balance between where I am taking the shot and the back ground.
>Compared to my old camera, this one should make it a few years.

Enjoy.

--
Ray Fischer

Stoneman wrote:

> I'm a photography noob so try not to flame my ass too much.
>
> I recently purchased a Fuji S700 and noticed that when I take pictures
> in the shade, and the sky is really bright, the light from the trees
> above can show purple fringes in the extreme edges. I have a few
> questions on how to minimize this problem.
>
This is a common problem with many digital cameras, fundamentally down
to the design of the lens and sensor. It's due to the angle that the
light from the lens strikes the sensor - at less than straight on the
microlenses don't pass the same amount of light to each of the red,
green & blue photosites in the Bayer array of the sensor.

This is different to chromatic aberation, which is when the lens
focusses different colours in slightly different places.

> - Would buying a UV or polarizing filter help cut down on the
> fringing?

Nope.

> - Should I just use Photoshop and remove it using software?
>
That's one way, though it can get tedious.

Although I find purple fringing is a problem with my Fuji S9500 at wide
angle (28mm equiv), the problem goes away when I zoom in slightly, and
at 50mm equiv it's unnoticeable even at 100%. The changing optical
path as I zoom in results in the light striking the sensor more straight
on. You might try zooming in a little, and stepping back.

> I got a super deal on the camera and I can live the the purple
> fringing. It only happens when there is a huge difference in the light
> balance between where I am taking the shot and the back ground.

I find that tree branches against the sky are the biggest problem.

Rich added these comments in the current discussion du jour ...

>> I recently purchased a Fuji S700 and noticed that when I take
>> pictures in the shade, and the sky is really bright, the
>> light from the trees above can show purple fringes in the
>> extreme edges. I have a few questions on how to minimize this
>> problem.
>>
>> - Would buying a UV or polarizing filter help cut down on the
>> fringing? - Should I just use Photoshop and remove it using
>> software?
>>
>> I got a super deal on the camera and I can live the the
>> purple fringing. It only happens when there is a huge
>> difference in the light balance between where I am taking the
>> shot and the back ground. Compared to my old camera, this one
>> should make it a few years.
>>
>> Cheers,
>>
>> Stoneman
>
> The purple fringe you see isn't really just fringe. The
> purple colour is diffused across the whole image. It is the
> defocused blue and red light cause by the lens not being able
> bring all colours to a single focus point. You can use PS or
> PSP, whatever and remove the purple glow as long as it isn't
> too bad or doesn't bleed directly into the object it
> surrounds. If you are forced to remove a lot of it, you can
> see all the image's colour change. The net result of the
> light being diffused across the whole image is a reduction in
> image contrast.
>
I've always thought, rightly or wrongly, that much of the color
fringing is chromatic aberration from the lens. I more often see
a turquoise color in my Rebel XT images rather than purple. PSP,
beginning with 9, has had a CA removal filter but I have found it
both problematical to use and relatively ineffective. When it is
really bad, I use a PSP 9 tool called Change To Target Brush to
mildly change the fringing to a grayer, less objectionable color.

--
HP, aka Jerry

Alex Monro added these comments in the current discussion du
jour ...

[snip]
> This is a common problem with many digital cameras,
> fundamentally down to the design of the lens and sensor. It's
> due to the angle that the light from the lens strikes the
> sensor - at less than straight on the microlenses don't pass
> the same amount of light to each of the red, green & blue
> photosites in the Bayer array of the sensor.
>
> This is different to chromatic aberation, which is when the
> lens focusses different colours in slightly different places.

I didn't know that fringing in this context is different than
classical CA, which I just commented on in another reply.
Interesting idea no matter what causes it.

[snip

--
HP, aka Jerry

HEMI-Powered wrote:

>>
>> This is different to chromatic aberation, which is when the
>> lens focusses different colours in slightly different places.
>
> I didn't know that fringing in this context is different than
> classical CA, which I just commented on in another reply.
> Interesting idea no matter what causes it.
>
>

Am I seeing this effect on my Canon 30D using the 24-105 f/4L
at absolute closest focus distance, at 105mm? There is certainly
something blurry and blue going on at edges near the corners.

It does not appear focused at reasonable (non-macro) distances.

It is correctable to some extent in software.

Doug McDonald

In article <feo899$hs9$>,
Doug McDonald <mcdonald@SnPoAM_scs.uiuc.edu> wrote:

> HEMI-Powered wrote:
>
> >>
> >> This is different to chromatic aberation, which is when the
> >> lens focusses different colours in slightly different places.
> >
> > I didn't know that fringing in this context is different than
> > classical CA, which I just commented on in another reply.
> > Interesting idea no matter what causes it.
> >
> >
>
> Am I seeing this effect on my Canon 30D using the 24-105 f/4L
> at absolute closest focus distance, at 105mm? There is certainly
> something blurry and blue going on at edges near the corners.
>
> It does not appear focused at reasonable (non-macro) distances.
>
> It is correctable to some extent in software.

Do a Google search. You can find step by step instructions.

--
Es ist nichts schrecklicher als eine tätige Unwissenheit.

Johann Wolfgang von Goethe