Image Editing Woes - red hue over image

[PLJ]

Hi

Advice greatfuly appreciated on my problem below...

I have been unhappy with the sharpness of my Canon 100-400 so I took some test shots to try and impove the quality of shots. This has now shown me how little I know about editing RAW images.

With my camera (EOS7d) set to RAW/JPEG I took a photograph of a lense test chart.

In the picture below the left had image is the RAW image the right hand side is the JPEG as processed by the camera.

In both, I have been into levels and reduced the white to 190 to whiten up the lens chart. I have also applied sharpening to the RAW image. The RAW image however has a definite red hue which I have been unable to remove and the blacks are no where near as black as the JPEG.

How do I get the RAW image back to the level of quality as the JPEG?

I am using Photoshop CS5.12.1 x32



The original RAW photograph can be downloaded from

http://www.yorkshireairnews.co.uk/im...mg_2800-10.zip

And the JPEG

http://www.yorkshireairnews.co.uk/im...mg_2800-10.jpg

Thanks for looking

Philip L Jackson

[GeoffWessex]

The link to the Raw image isn't working (Error404). I'm assuming it's just a file on the web server - as you can't actually display a Raw image on a webpage anyway.
One of the best ways to get a true white back into the Raw while processing in ACR - use the eyedropper tool and click it on the background white (or any other part that should be true white).
Could be that the Auto White Balance in the camera hasn't found a true white, but the processor in the camera (turning it into a Jpeg) has done better.

[PLJ]

Hi

Thanks for your suggestions.

Sofar the best result I have found is to use DPP to get the 'brightness' back - the photograph was taken with the camera settings set to 'Landscape' which DPP recognises and opens without the hue.

Re download, I have changed the file to be a zip file which does download.

Best Wishes

Philip L Jackson

[LaPistola]

If its a red hue then using the HSL in camera raw reduce the red hue slider. Use the eye dropper to get a custom white balance and check that the white is showing as colour 255 255 255. If not keep tweaking until it does say 255 255 255 or the 3 numbers are the same (or within 2-3 points either way) and in the 200 range. This way you know its colour correct on the computer. 255 255 255 actually means clipped/over exposed highlights and not detail but with paper should be fine. Another thing you could try is reducing the colour temp and hint

Don't forget that monitors are not all correctly set up colour wise. On my Laptop the RAW is showing a red hue but the JPEG is showing whites as grays. So its always best to check the colour codes first so you know whether its the monitor/printer or your eyes.

[GeoffWessex]

Looks to me that both files are underexposed - hence the grey found by LaPistola...... the camera meter is seeing a predominantly white image and is (like every meter) trying to give you a grey midtone. There couild also be some colour and exposure influence from the wooden surround.

I don't actually see a red cast on the Raw, but it's easily removed.