calibration

[Stefan]

Even with SF 5.5.0r06(powerlook3000/WinMe)I have to turn calibration off manually,when I work with Negafix.Why doesn`t it turn off automatically?

[ilyons]

Stefan,

On 2001-09-05 19:22, Stefan wrote:
Even with SF 5.5.0r06(powerlook3000/WinMe)I have to turn calibration off manually,when I work with Negafix.Why doesn`t it turn off automatically?

I'm not absolutely sure that SilverFast for the Umax is YET the same point as for the Polaroid units. However, it is my understanding and certainly what I am seeing that the the calibration does NOT get nor does it need to be turned off. The President has already advised us of this in an earlier post. With the Polaroid units the selection of negatives has the effect of telling SilverFast to NOT embed ANY profile and to ignore the the calibration or selected scanner profile. My tests would suggest that this is exactly what happens.

BTW: I have updated the NegaFix tutorial to show this and I have also added another page that attempts to address your eariler questions regarding Assign and Convert, etc.
The new page can be found at:


http://www.computer-darkroom.com/sf5-ne ... f5_cms.htm


Ian



<font size=-1>[ This Message was edited by: ilyons on 2001-09-05 21:36 ]</font>

[Stefan]

Hi Ian,
thanks for your reply.I checked everything again.But it really is the way I described it in my earlier post.When I have calibration on and try to get a specific point gray by using ?curves" in Negafix and pulling the small point down to the gray area it is not going to become gray but green.If I do the same with calibration switched off(and I also did a new prescan in order to make sure that everything that happens is based on the new setting) it becomes exactely gray.It obviousely works different with your polaroid scanners.Since I know that I have to switch calibration off,it`s no problem.It`s just annoying that sometimes I forget to do it.BTW Negafix is really working very good.
Stefan

[ilyons]

Stefan,

I now remember your earlier message regarding this problem. I also recall the President mentioning that a fix would soon be forthcoming for the Umax

Ian

[Stefan]

Thanks again,Ian.
In my earlier post I forgot to mention,that there really is NO profile embedded when working with Negafix.But calibration changes the colors in the way I described above.So IT8 seems to work within Negafix,although the profile is not embedded,when the file goes to Photoshop(where the picture comes out green in case of calibration turned on)
Stefan

[ilyons]

So IT8 seems to work within Negafix,although the profile is not embedded,when the file goes to Photoshop(where the picture comes out green in case of calibration turned on)
Stefan

Sounds familiar. They Polaroid also did that in the first release, but it should have been fixed in the current release. I'm pretty confident that in this regard you will be a lot happier with the next release. Just keep watching the update page

A further thing to remember when using NegaFix. Because NO profile is embedded in your image it will immediately be Assigned the current Photoshop working space upon opening in Photoshop. Therefore for consistency in appearance between the SilverFast preview and Photoshop it is important that the profile selected for Internal in SilverFast is the same profile as your current Photoshop working space. This applies to Photoshop 5 and 6 users.

Ian


<font size=-1>[ This Message was edited by: ilyons on 2001-09-05 23:49 ]</font>

[Tomaz Klinc]

As the de facto spokesman for, and interpreter of, SilverFast, Ian
deserves to be applauded by all users who are intimidated and mislead
by the dreary 'English' version of the Manual. All the much so, as
LSI seems to prefer staying out of sight at this forum and rather bask in the
glory of their software.

The "quick and dirty" tutorial at
http://www.computer-darkroom.com/sf5-ne ... f5_cms.htm is one more
proof that there is a lot of cleaning up to be done in one's mind
after reading all the nonsense in the Manual's two Color Management
sections.

However, quick and dirty job nonwithstanding, Ian should be careful
enough to do quotes accurately. For example, the 'Scanner ->
Internal' option in the CMS field is misquoted as 'Scanner Internal'.
Much fuss about a small point? I dont't think so, since the very
symbol '->' is probably the culprit of much confusion. If, as I
believe, 'A -> B' is to be understood as '[from] A to B', than why,
for heaven's sake, not write 'A to B' that everybody understands.

Glad to read in the same tutorial that

To avoid any ambiguity the Internal colour space profile is that
associated with Photoshop and NOT SilverFast.

So, at last, Ian seems to agree with me.

Ian's tutorials would be even better by alerting users to various gross
errors in SF's documentation. Just two examples from Manual, dated
1/00, page 132, under the title Scanner -> Internal:

"<None>: You renounce matching of the scanner color [sic] (used to
be 'colour' on p.30) to the color space of the imaging software.
Colors on the monitor may deviate from the image sample".

Escapes me what's the purpose of brackets that surround None; the
rest is utter nonsense; in particular, this has nothing to do with
the monitor. Choosing None just means that SF accepts raw scanner
data at their face value, and at a conscious user's peril; all the
rest will be affected by this, and if monitor compensation is on,
you'll see raw image on screen. Presumably, 'the image sample' is
just a mistranslation of 'the image being scanned.'

"Calibration: The image sample will be passed on to the imaging
application color-exact ..."

What is this 'imaging application'? Photoshop, or the plugged-in
SilverFast? Of course, it is SF, since at this point we are within

it. By choosing this option the raw data from scanner will be
translated, or maped, to more accurate data in accordance to the
dictionary established by IT8 calibration. Than, for example, when
the scanner says the middle square data of the Q60's gray scale is
R=129, G=127, B=131, SilverFast knows that R=128, G=128, B=128
is ment.

<font size=-1>[ This Message was edited by: Tomaz Klinc on 2001-09-06 11:33 ]</font>