[argyllcms] Re: targen options

Hello Gerhard
Do you see the effects both printing with and without colormanagement ?
In this case, it is definitly a problem of the driver, and it is 
hopeless to try to get better results with profiles.

But when the stripes only occurs WITH colormanagement, ist is a problem 
of the profiles.

sometimes smoothing profiles lead to worse colorimtry but better grey axis.

If you just convert the numbers of an RGB gray gradient and plot the 
results as curves, you see the irregularities of this combination of 
profiles.

Calculating an RGB2RGB devicelink and smoothing this, may helps.

:-) Jan-Peter


Gerhard Fuernkranz schrieb:
> Graeme Gill schrieb:
> 
> 
>>In theory I suppose so, although if the device is that
>>badly behaved that it is noticeably inaccurate a few
>>delta E away from a given neutral axis, I'm not sure
>>there is much hope for it.
>>
> 
> Btw, I found the test prints I had archived.
> You can take a look at http://home.arcor.de/gfuer/tmp12116/
> In the device RGB image sent to the printer driver, the gray
> wedge on the left side has pretty smooth RGB gradients.
> But in scanned_print1.jpg you can see horiziontal stripes,
> i.e. the printed color changes rapidly as a function of the
> gray level (at the dark end there is a color "jump" at approx.
> every 2 RGB levels). Since these stripes only occur in color
> gradients, and not in areas with a uniform color, it is evident
> that they are caused by the printer's color response (and not
> e.g. congested nozzles).
>


-- 
--

homann colormanagement ------ fon/fax +49 30 611 075 18
Jan-Peter Homann ------------- mobile +49 171 54 70 358
Kastanienallee 71 ------- http://www.colormanagement.de
10435 Berlin --------- mailto:homann@xxxxxxxxxxxxxxxxxx

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