Creating scanner profiles

[swashbu]

I did a search on the forum and found the document "Colour Managed Workflow for Epson Scanners and Printers". It is really thorough and I followed it to create profiles for my 4870 scanner and 1280 printer.

One thing about the process really confuses me so I would appreciate any comments/help. The article says to scan the target in silverfast using 48 bit HDR color BUT when you use this profile in Silverfast to scan at 48->24 bit color. Shouldn't the "scan type" for both creating the profile AND using the profile be the same???

Any comments would be appreciated and Happy Holidays!

[RAG]

Using 48-bit should be OK since the 48 -> 24 is down sampling via software, right? This would mean you should get better results because you have effectively profiled the 48-bit (three sixteen bit channels) source that is being used to create the 24-bit (three 8 bit channels) rendition.

Merry Christmas and a Happy New Year to all!!!

[swashbu]

RAG,
That's what I thought but if I use the profile I created with 48bit HDR all my scans at 48 bit and 48-24 are too bright. Eg. If I rescan the target using the new profile and scan at 48bit the resulting scan is way to bright.

I tried to create profiles at 48bit and 48-24bit settings but EasyColor tells me that there is not enough information in the dark areas/shadows of the scan of the target to create a profile.

I guess I'll just scan everything at 48bit HDR

[RAG]

What I did with my 4990 was to find out which profile was being used by Epson Scan and then selected the same profile in SilverFast. Now I get stellar results.