Hi John,
I have produced a profile for my 8400F scanner in the past also for my newer and cheap Lide 110.
I've looked back at the images and they are dark with a similar histogram to yours.
PP gave error messages but the profiles, when used, seemed to produce good results in both cases.

Yes.

I assume you are producing a 48bit "raw" image from Vuescan.

Terry

As it's an LED scanner, it has some advantages wrt colour Metamerism I believe.
Terry

Terry, I purchased the LiDe 110 this morning.
I have a black sheet that occupies the entire scanner window.
First thing first. Profiling the scanner.
When I bring the 48bit scanned with 5x passes IT8 target into PP, it seems obvious to answer No. See the attached.
The same histogram jammed on the dark side. The familiar light variance report as with the 8400F.
Reading the instructions for the Canon scanner in Help (as copied below) it says to say Yes. See the second attachment.
Are my settings correct in both attachments??
The Yes histogram is encouraging, but the report isn't.
Can you pick where I'm going wrong?

Regards,

John

Canon Scanners

Included Canon software usually not sufficient to get good scans without clipping
Specialized scanning software such as VueScan recommended
Recommended VueScan settings:

First, click "Scanner", "Calibrate" with scanner lid closed, white pad in place
On the "Input" tab, select "48 bit RGB" for "Bits per pixel"
On the "Input" tab, select "300 dpi" for "Scan resolution"
On the "Output" tab, select "Output raw file"
UNcheck Output TIFF, JPEG, and index file so only the raw file is saved
UNcheck "Raw compression" on the same tab
Set "Raw file type" to "48 bit RGB" on the same tab
Scan
Open scan in Profile Prism and reply "Yes" to the linear 48 bit scan prompt
Proceed with profiling steps

Hi John,
First, just to clarify re.
You do not need to profile the scanner for making print profiles as a "raw" file is used from Vuescan.
Your results look similar to mine. I did check some other documentation I have which seems to confirm to answer "No".
Maybe we can get Mike to answer on this one.
The new Canon Driver for Lide scanners is now much improved apparently and it is possible to use the Twain feature via Qimage Ultimate to import and save a scan. There are settings in the Advanced mode & preferences to turn off colour adjustment and set 48 bit. However QU is a 16 bit app so I cannot remember what happens there. I have used this method for printer profiles and got reasonable results.
Terry

Also, with any Canon LiDE scanner and most scanners built in the last ~5 years, I would recommend using the manufacturer's Twain software instead of VueScan.  While it is possible to get better results with VueScan, that software has gotten so complex in recent years that it is nearly unusable for getting scans with optimal exposure.  There are dozens of parameters that affect exposure and more than a few are linked to one another, making it almost like trying to adjust a carburetor that has 20 mixture screws, all of which are inter-related.  For most end users, it's far easier to get better scans using the manufacturer supplied Twain software than spending hours trying to decipher the hundreds of cryptic settings in VueScan.

That's my .02

Mike

Thanks Mike & Terry, that's been a big help, although painful having bought VueScan specifically for this purpose.
Another duhhh moment for me with the marking of the corners Mike.
Copying your method Terry (only difference is the page setting is greyed out) I seem to be getting random results re the number of X'd patches.
Only by setting the brightness -20 in the Canon software was I able to get rid of the Warning and change it to Note, but there's no consistency to it.
Would you look at the end of the file name for the brightness setting and the report in the image.
Or at -20 have I hit a sweet spot with the brightness?? Going either way causes the Warning number of Xs.
Is that possibly how it works??
I notice my histogram is very similar to Terrys, but not as deep.
Is the first attachment a file I could carry on in the process with?? Or are there still problems?

Thanks,

John

At 1am this morning I realized where I was going wrong. I'm going to keep my stupidity to myself.
The Quick Start instructions saved the day for me.
I think the volume of instructions had me rattled.
I went back to VueScan also.
The attached is giving good print & screen match. Exposure is 247.
And the Epson Print Preview is a perfect colour match. Color Munki profile print previews are no where near what ends up on the print. I thought the preview wasn't colour managed.
I've got a good feeling about PP and me getting along very well from now on.


Regards,

John