V700 green cast when scanning art

[GUpfold]

Hi there. When scanning the silverfast taget after calibration I get good results with the grey squares quite neutral especially the midtones. If I scan art or even a 24 patch Macbeth card. I get what looks like a green cast over the image with the red numbers lower than green and blue in the grey patches eg. Second darkest patch with R 90 G 100 B 98, this is similar in the midtones and highlights.

This is happening painted art I scan but seems to be less noticable with photos. I thought it might be my target so I got a new one from Silverfast and its the same result.

Is there a way to correct the profile or profile for this kind of media if thats what it is, any suggestions

[LSI_Heidorn]

Dear GUpfold,
hmm, this sounds strange -> getting neutral results on the IT8 Card and getting greenish results in another scan...

Do you use Automatic Function before scanning the art scan ?
It could be that the automatic tries to get rid of a magenta cast it senses, thus moving the image towards green ?!

Greetings,

Nils Heidorn

[GUpfold]

Hi Nils. thanks for the reply, sorry I was out for a few days.

No I dont use the auto at all. The profile it creates seems to fix a cast on the target to get it neutral then when applying the profile to ther scans it makes them greener. I made a curve in photoshop to try and correct it and if I appy the curve to the macbeth scan it makes it very acurate and neutral and if I apply it to a scan of the iT8 target it turns very magenta! It is almost like the target is not grey at all so the profile tries to make it grey.

So how do I get a scan with out the cast?

Both these scans were done with same settings. Ntice the cast in the grey patches on the macbeth card

[LSI_Heidorn]

Dear GUpfold,

first to clear up a very common misunderstanding:
An IT8 Target Grayscale does not have to be neutral !
While we try to get it neutral, it can have a visible colorcast, the only really important case is that the measured data ( the Reference Data ) exactly reflect the ( however slight ) colorcast !

This is the same for the Gretag MacBeth Target !
But as you are stating that you see the same green cast on other images ( artwork ) we first assume that the Gretag Target is okay...

hmm, assuming this, there is one thing that could've gone wrong:



-Your Scanner shows an unusual high difference between the prescan ( draft mode ) which is used while calibrating and the end scan.
Please enter the Options -> Special Menu and make sure that both Prescan and Endscan use the Quality Mode ( normally Prescan is done at higher speed and less Quality which *normally* does not show a difference for calibrating as the main difference is noise, not color accuracy.


if you have a LaserSoft Target and the method above doesn't help i have to rethink, please give it a try...



Greetings,

Nils Heidorn

[GUpfold]

Hi Nils. That didnt make any diference when changed and reprofiled?

I found and tried the profile Epson provided with the scanner (Epson V700) and I get better results than with the one I made with the silverfast target in Silverfast.

I tried scanning without any color management at all then assigned the profiles in photoshop to check the difference and the epson one is still better.

I am sure I should be getting better results?

[LSI_Heidorn]

Dear GUpfold,
indeed you should have more precise Scans from an individually created profile !
I will confer with our IT8 wizard, let me see if he go comments / hints to what is going (slightly) wrong here...

Just one thing i forgot to ask before:
Are you doing the Scans with Multi-Exposure ?! Sometimes this can result in a slight Color Shift...

Greetings,

Nils Heidorn