JPEG
Here’s my original image with one with a purple cast from using Fluorescent white balance.
Image with Auto in camera white balance
|
Image with Fluorescent
white balance
|
JPEG
Procedures
This café image has a very distinctive purple colour cast so I needed to remove it by firstly using the grey point in Levels, see below:
Even
with this the picture still has a distinctive purple cast so I opened up the
Colour Balance palette and adjusted the three sliders to eliminate it as much
as possible. The new readings were:
Cyan/Red -6, Magenta/Green +4, Yellow/Blue +15
I think it would be virtually impossible to remove the colour cast from the notices in the window but I used the Magnetic Selection tool to selection just the notices and used the Colour Balance palette to make additional changes.
The additional changes I made were:
Cyan/Red -30, Magenta/Green +47, Yellow/Blue -30
These
do seem to have restored the notices to a more natural colour as you can see
from the Closed notice which should have been white but still retains the
purple cast.
Here’s
the before and after pictures to compare:
Before |
After |
RAW
This
is the image again with the Auto white balance as a point of reference
Original image |
You
can see that there is a large amount of red in the picture, indicating that
there is very little detail in those areas.
See screenshot below to see background details in the image:
I
used the sliders to alter the image and remove the purple cast in the following
amounts:
Recovery
25, Blacks 2, Brightness +47, Contrast +19
And
the image changed to a more balanced colour way:
Using the RAW settings enabled me to get a more realistic image than from the JPEG image and having to work on it after I had opened it. The RAW image stored information which could be changed more easily and successfully.
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