[argyllcms] Creating camera profiles with Argyll

  • From: "Pascal de Bruijn" <pmjdebruijn@xxxxxxxxx>
  • To: argyllcms@xxxxxxxxxxxxx
  • Date: Tue, 11 Nov 2008 12:56:02 +0100

Hi,

I've been fiddling with ArgyllCMS to create a camera profile, which
seems to go well so far.

Though I'm curious about three things:
1. Ultra quality seems extremely slow... Much Much Much slower than
High quality... I've
had high quality compute in a minute or three... While I've had Ultra
quality running for
tens of minutes (after which I aborted). Is this normal?

The point why I was considering using ultra is to get 4096 entry
resolution instead of the 2048
which high quality produces. The general reasoning would be my camera
produces 12bit data,
which "means" 4096 entries.

2. The generated profile has a A2B0 table and a B2A0 table, but do I
really need both? I think
Nikon generates a high res A2B0 table, and a low res B2A0 table. Can I
do something similar
with Argyll?

tag 3:
  sig      'A2B0'
  type     'mft2'
  offset   344
  size     221254
Lut16:
  Input Channels = 3
  Output Channels = 3
  CLUT resolution = 32
  Input Table entries = 4096
  Output Table entries = 3
  XYZ matrix =  1.000000, 0.000000, 0.000000
                0.000000, 1.000000, 0.000000
                0.000000, 0.000000, 1.000000

tag 4:
  sig      'B2A0'
  type     'mft2'
  offset   221600
  size     250
Lut16:
  Input Channels = 3
  Output Channels = 3
  CLUT resolution = 3
  Input Table entries = 3
  Output Table entries = 3
  XYZ matrix =  1.000000, 0.000000, 0.000000
                0.000000, 1.000000, 0.000000
                0.000000, 0.000000, 1.000000

3. I also noticed Argyll identifies itself with 'argl', however all
other profiles I've
inspected so far use caps to identify themselves. Just of out curiosity, why
the lower caps?

Regards,
Pascal de Bruijn

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