THotPDF.RegisterLabColorSpace

THotPDF

Registrira barvni prostor PDF 1.3 CIELab (ISO 32000-1 8.6.5.3) pod samodejno generiranim imenom vira (Lab1, Lab2, ...). Vrnjenemu imenu uporabite s THPDFPage.SetFillColorSpace / SetStrokeColorSpace, nato pa SetFillColor / SetStrokeColor s tremi komponentami L*a*b*

Delphi syntax:

function RegisterLabColorSpace(WhitePointX, WhitePointY, WhitePointZ: Single; RangeAMin, RangeAMax, RangeBMin, RangeBMax: Single): AnsiString;

C++ syntax:

AnsiString RegisterLabColorSpace(float WhitePointX, float WhitePointY, float WhitePointZ, float RangeAMin, float RangeAMax, float RangeBMin, float RangeBMax);

Description

Barvni prostor CIELab opisuje barve neodvisno od katere koli prikazovalne ali tiskalne naprave: L* izraža svetlost v [0..100], a* os zeleno/rdeče in b* os modro/rumeno (običajno [-128..127]). Skladni pregledovalniki PDF pretvorijo L*a*b* v barvo naprave z uporabo nastavljenega osvetljevalca WhitePoint. Pogosti osvetljevalci

D50  - ICC print standard. WhitePoint = [0.9505, 1.0, 1.089].

D65  - sRGB / display standard. WhitePoint = [0.95047, 1.0, 1.08883].

WhitePoint Y must equal 1.0 per spec table 64; X and Z must be positive. Passing all four Range parameters as zero falls back to the spec's implicit default [-100 100 -100 100]; pass any non-zero combination to override.

Povratna vrednost: samodejno generirano ime vira (Lab1, Lab2, ...). Vrne prazen niz, kadar je StrictVersionLock vklopljen in je aktivna Version pod PDF 1.3 (sicer se različica samodejno poviša na 1.3)

// Register a D50 Lab space for print, paint a magenta swatch
var
  CSName: AnsiString;
begin
  HPDF.Version := pdf14;
  HPDF.BeginDoc;
  CSName := HPDF.RegisterLabColorSpace(
    0.9505, 1.0, 1.089,        // D50 WhitePoint
    -128, 127, -128, 127);     // standard a* and b* range
  HPDF.CurrentPage.SetFillColorSpace(CSName);
  HPDF.CurrentPage.SetFillColor([50.0, 60.0, -50.0]);  // L* a* b*
  HPDF.CurrentPage.Rectangle(60, 60, 200, 100);
  HPDF.CurrentPage.Fill;
  HPDF.EndDoc;
end;

Glejte tudi

Version, Compression, PDF Filter Support