lcms-user

[Lcms-user] Scanline Transform

[Armindo Da S. <tec...@wa...>]

Hello,

in a 24 bits bitmap, instead of storing rgb value I store Lab value,
I do some process and then I convert it to RGB with

cmsDoTransform(hTransform, TheScanline, TheScanline, TheWidth);
where
hTransform :=3D cmsCreateTransform(LabProfile,
                TYPE_Lab_8,
                DisplayProfile,
                TYPE_BGR_8,
                INTENT_PERCEPTUAL,0);

it works fine

now I want to do the same with a 32 bits picture where instead of Having =
RGBA I have LabA

but now how can I do my transform with scaline? the problem for me is =
that the TYPE_Lab_8 is only 3 bytes.

Any idea?

thanks

Armindo

Re: [Lcms-user] Scanline Transform

[<ma...@li...>]

Hi,

Just build your own descriptor:

#define TYPE_LabA_8      =
(COLORSPACE_SH(PT_Lab)|CHANNELS_SH(3)|BYTES_SH(1)|EXTRA_SH(1))

In delphi this equals to  $a0099=20


Regards,
Marti.

  ----- Original Message -----=20
  From: Armindo Da Silva=20
  To: lcm...@li...=20
  Sent: Monday, December 03, 2001 11:07 AM
  Subject: [Lcms-user] Scanline Transform


  Hello,

  in a 24 bits bitmap, instead of storing rgb value I store Lab value,
  I do some process and then I convert it to RGB with

  cmsDoTransform(hTransform, TheScanline, TheScanline, TheWidth);
  where
  hTransform :=3D cmsCreateTransform(LabProfile,
                  TYPE_Lab_8,
                  DisplayProfile,
                  TYPE_BGR_8,
                  INTENT_PERCEPTUAL,0);

  it works fine

  now I want to do the same with a 32 bits picture where instead of =
Having RGBA I have LabA

  but now how can I do my transform with scaline? the problem for me is =
that the TYPE_Lab_8 is only 3 bytes.

  Any idea?

  thanks

  Armindo

Re: [Lcms-user] Scanline Transform

[Armindo Da S. <tec...@wa...>]

Hi Marti,

thanks for your tips, it works fine.
You new web site is very nice.

Your delphi sample is very interesting in particular concerning the icc =
files inside the combobox.....

thanks

Armindo


  Hi,

  Just build your own descriptor:

  #define TYPE_LabA_8      =
(COLORSPACE_SH(PT_Lab)|CHANNELS_SH(3)|BYTES_SH(1)|EXTRA_SH(1))

  In delphi this equals to $a0099=20


  Regards,
  Marti.



    Hello,

    in a 24 bits bitmap, instead of storing rgb value I store Lab value,
    I do some process and then I convert it to RGB with

    cmsDoTransform(hTransform, TheScanline, TheScanline, TheWidth);
    where
    hTransform :=3D cmsCreateTransform(LabProfile,
                    TYPE_Lab_8,
                    DisplayProfile,
                    TYPE_BGR_8,
                    INTENT_PERCEPTUAL,0);

    it works fine

    now I want to do the same with a 32 bits picture where instead of =
Having RGBA I have LabA

    but now how can I do my transform with scaline? the problem for me =
is that the TYPE_Lab_8 is only 3 bytes.

    Any idea?

    thanks

    Armindo

[Lcms-user] Version 1.08 released

[<ma...@li...>]

Hi,

The new 1.08 version is released, and available
on site. http://www.littlecms.com

Feel free to submit any questions about it.

Regards,
Martí Maria
The little cms project
http://www.littlecms.com
ma...@li...