Purple Haze - G5

Bob Adler · Jun 27, 2003

Just bought a G5 last week and really am enjoying many aspects of it. One annoying item however is the purple halo around bright spots. This was noted in Digital Camera Resource review ( http://dcresource.com/reviews/canon/powershot_g5-review/index.shtml ) go about 4/5 down the page.
Anyone have any ideas on how to fix this other than increasing f-stop or ISO?
Thanks and wondering if anyone else has this issue.
Bob

dchao · Jun 27, 2003

Bob,

This is called purple fringing and is caused by a combination of Chromatic Aberrations (CA) from the lens and inherent defect of the CCD sensor.

Phil Askey has an article on this subject and how to fix it.

http://www.dpreview.com/learn/Glossary/Optical/Chromatic_Aberrations_01.htm

I even get purple fringing even at f/6.3, 1/100s. See picture here:

So there is no way to avoid it. The best way to reduce it by taking well balanced picture in the first place. My advise is to check your images after shot is taken for overexposure in reply mode. If an area is flashing, reduce exposure and re-take the picture, until there is no warning left.

Bob Adler said:
Just bought a G5 last week and really am enjoying many aspects of
it. One annoying item however is the purple halo around bright
spots. This was noted in Digital Camera Resource review (
http://dcresource.com/reviews/canon/powershot_g5-review/index.shtml
) go about 4/5 down the page.
Anyone have any ideas on how to fix this other than increasing
f-stop or ISO?
Thanks and wondering if anyone else has this issue.
Bob

idiau duvilaj · Jun 27, 2003

Strategies to reduce its occurrence:

1- Avoid blocking highlights (under-expose a little on the low-lights, you can retrieve them later in an editor).

2- Have a UV filter on your camera. It makes a big difference with my G3, it will probably help just as much on the G5. (See http://www.cliffshade.com/dpfwiw/filters.htm look for "Purple Fringing Artifact".)

3- Use a polarizing filter or cokin filters to reduce the brightness of the sky or of reflected highlights.

I have found a combination of 1 and 2 sufficient in most cases.
--

Bob Adler said:
Just bought a G5 last week and really am enjoying many aspects of
it. One annoying item however is the purple halo around bright
spots. This was noted in Digital Camera Resource review (
http://dcresource.com/reviews/canon/powershot_g5-review/index.shtml
) go about 4/5 down the page.
Anyone have any ideas on how to fix this other than increasing
f-stop or ISO?
Thanks and wondering if anyone else has this issue.
Bob

Bob Adler · Jun 30, 2003

Thanks to all for the suggestions. Canon responded to reduce the aperture (doh). I have a UV filter on the camera now, permanently.

Would shooting in RAW mode help? That way I don't have to worry about white balance. Just a thought; one that I can try on my own.

Thanks again to all who responded. In case you're interested, here's Canons response:
*********
Dear Robert,

Thank you for your inquiry. On behalf of Canon, we apologize for the
issue that you have been experiencing with the purple halo around
bright
areas in your pictures. As a Canon customer your satisfaction with our
products and service is very important to us. We remain committed to
doing our best to provide excellent support of our products and
warranties.

You can try adjusting exposure compensation and white balance for
better
images. If changing the settings above does not correct this issue,
then
the camera will need to be examined by a service technician. For
factory
service, forward your digital camera (remove the CF card and battery)
properly packaged and insured, with a letter describing the
difficulties. Be sure to include your name, address, telephone number,
and proof of warranty (if applicable). Send to the Canon Factory
Service
Center at the following address:

Canon U.S.A., Inc.
6325 Muirfield Drive
Hanover Park, IL. 60133
Attention: Factory Service

Telephone: (630) 250-6500
Business hours: 9:00 a.m. - 5:00 p.m. (Central) Monday-Friday

Your equipment will be examined and you will be advised of the
findings.
The Service Center will be able to give you repair and pricing
information.

Thank you for choosing Canon.

Sincerely,

Trenis
Product Support Representative

Customer Satisfaction... The most important product we support!

Original Message Follows:
-------------------------

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MAIL_FROM=[email protected]
FIRST_NAME=Robert
MIDDLE_INITIAL=
LAST_NAME=Adler
PRODUCT_CATEGORY= #
PRODUCT_MODEL=Powershot G5
PRODUCT_SERIALNO=
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CITY=
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COUNTRY=USA
POSTAL_CODE=
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INQUIRY=There is a purple halo around bright areas in many of my
photos. How can I fix this?
CONNECTION=
CUSTOMER_TYPE=U
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USER_AGENT=Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.0; .NET CLR
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Idiau Duvilaj said:
1- Avoid blocking highlights (under-expose a little on the
low-lights, you can retrieve them later in an editor).

2- Have a UV filter on your camera. It makes a big difference with
my G3, it will probably help just as much on the G5. (See
http://www.cliffshade.com/dpfwiw/filters.htm look for "Purple
Fringing Artifact".)

3- Use a polarizing filter or cokin filters to reduce the
brightness of the sky or of reflected highlights.

I have found a combination of 1 and 2 sufficient in most cases.
--

Bob Adler said:

Just bought a G5 last week and really am enjoying many aspects of
it. One annoying item however is the purple halo around bright
spots. This was noted in Digital Camera Resource review (
http://dcresource.com/reviews/canon/powershot_g5-review/index.shtml
) go about 4/5 down the page.
Anyone have any ideas on how to fix this other than increasing
f-stop or ISO?
Thanks and wondering if anyone else has this issue.
Bob

Click to expand...

Suzy Q15 · Jun 30, 2003

This is not just a G5 idiosyncracy. 1. You need to learn to judge to photo beforehand in order to determine if you will get this blooming effect. Tree leaves against a bright sky is always going to have some. 2. Just adjust the camera setting to compensate as much as possible. 3. Photoshop (or any editing program that has advanced color functions) can be a real lifesaver and with judicious use can almost eliminate any remaining problems.

Bob Adler said:
Thanks to all for the suggestions. Canon responded to reduce the
aperture (doh). I have a UV filter on the camera now, permanently.
Would shooting in RAW mode help? That way I don't have to worry
about white balance. Just a thought; one that I can try on my own.
Thanks again to all who responded. In case you're interested,
here's Canons response:
*********

srv42 · Sep 15, 2003

re: purple fringing -
If a new user is using the G5 (with the Green Square setting ie. full auto )
this problem (in practice) should not occur.
In my theories if Canon knew about purple fringing and what causes it
they would have tested the camera properly in the real world
and compensated for these things.

I've had a G2 , G3 ( for about 2 months ) and now the G5.
I must say that I'm very disappointed in the G5.
I miss my G2, it was easy to get great shots without even trying.

Another thing - Red Eye is bad on the G3 and G5, the G2 had a better flash in my opinion. ( ideal is 420ex though )

The G5 is just plain frustrating with purple fringing.
I'm going to try permanently using a UV filter now, but if it
was this bad why didn't they just coat the lens with some kind of UV filter??
Just a thought.

Anyone considering between a G3 and G5, I would stick with the G3.

I think the Black sucked me in....

Susan Watling said:
This is not just a G5 idiosyncracy. 1. You need to learn to judge
to photo beforehand in order to determine if you will get this
blooming effect. Tree leaves against a bright sky is always going
to have some. 2. Just adjust the camera setting to compensate as
much as possible. 3. Photoshop (or any editing program that has
advanced color functions) can be a real lifesaver and with
judicious use can almost eliminate any remaining problems.

ijaaad · Sep 15, 2003

Idiau Duvilaj said:
1- Avoid blocking highlights (under-expose a little on the
low-lights, you can retrieve them later in an editor).

2- Have a UV filter on your camera. It makes a big difference with
my G3, it will probably help just as much on the G5. (See
http://www.cliffshade.com/dpfwiw/filters.htm look for "Purple
Fringing Artifact".)

3- Use a polarizing filter or cokin filters to reduce the
brightness of the sky or of reflected highlights.

I have found a combination of 1 and 2 sufficient in most cases.
--

Bob Adler said:

Just bought a G5 last week and really am enjoying many aspects of
it. One annoying item however is the purple halo around bright
spots. This was noted in Digital Camera Resource review (
http://dcresource.com/reviews/canon/powershot_g5-review/index.shtml
) go about 4/5 down the page.
Anyone have any ideas on how to fix this other than increasing
f-stop or ISO?
Thanks and wondering if anyone else has this issue.
Bob

Click to expand...

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