'Declaration<ComVisibleAttribute(True)> Public Enum PdfImageMaskType Inherits System.Enum
[ComVisible(true)] public enum PdfImageMaskType : System.Enum
public enum PdfImageMaskType = class(System.Enum)
ComVisibleAttribute() public enum PdfImageMaskType extends System.Enum
[ComVisible(true)] __value public enum PdfImageMaskType : public System.Enum
[ComVisible(true)] public enum class PdfImageMaskType : public System.Enum
| Member | Value | Description |
|---|---|---|
| PdfMaskTypeColorKey | 4 | In PDF 1.3, the Mask entry in an image dictionary may alternatively be an array specifying a range of colors to be masked out. Samples in the image, that fall within this range, are not painted, allowing the existing background to show through. The effect is similar to that of the video technique known as chroma-key. |
| PdfMaskTypeExplicit | 2 | In PDF 1.3, the Mask entry in an image dictionary may be an image mask, as described above under “Stencil Masking”, which serves as an explicit mask for the primary (base) image. The base image and the image mask need not have the same resolution (Width and Height values), but since all images are defined on the unit square in user space, their boundaries on the page will coincide, that is, they will overlay each other. The image mask indicates which places on the page are to be painted and which are to be masked out (left unchanged). Unmasked areas are painted with the corresponding portions of the base image, masked areas are not. |
| PdfMaskTypeNone | 0 | Standard bitmap without masking operation. |
| PdfMaskTypeSoft | 3 | Defines the Alpha channel to be applied to another image. |
| PdfMaskTypeStencil | 1 | A monochrome image, in which each sample is specified by a single bit. However, instead of being painted in opaque black and white, the image mask is treated as a stencil mask, that is partly opaque and partly transparent. Sample values in the image do not represent black and white pixels, rather, they designate places on the page that should either be marked with the current color or masked out (not marked at all). Areas, which are masked out, retain their former content. The effect is like applying paint in the current color through a cut-out stencil, which lets the paint reach the page in some places and masks it out in others. |
| PdfMaskTypeUnknown | -1 | Unknown mask mode. |
System.Object
System.ValueType
System.Enum
GdPicture14.PdfImageMaskType