IDOMImage Filters
Introduction
Mako provides several filters that operate on an IDOMImage
. These are both convenient and powerful, making complex image processing a matter of a few lines of code.
For example, when Mako loads a CMYK JPEG, the image is inverted. The simplest way to solve this is to add an inverter:
const IJawsMakoPtr mako = IJawsMako::create();
...
if (newImage->getImageType() == eDITJPEG && newImage->getImageFrame(gMako)->getNumChannels() == 4)
newImage = IDOMFilteredImage::create(mako, newImage, IDOMImageInverterFilter::create(mako));
var mako = IJawsMako.create();
...
if (newImage.getImageType() == eDOMImageType.eDITJPEG && newImage.getImageFrame(mako).getNumChannels() == 4)
newImage = IDOMFilteredImage.create(mako, newImage, IDOMImageInverterFilter.create(mako));
var mako = IJawsMako.create();
...
if (newImage.getImageType() == eDOMImageType.eDITJPEG && newImage.getImageFrame(mako).getNumChannels() == 4)
newImage = IDOMFilteredImage.create(mako, newImage, IDOMImageInverterFilter.create(mako));
Table of filters
Filter | Purpose |
---|---|
| An image filter that presents optionally an image stripped of alpha, or alternatively a Gray image representing the extra channel (i.e., Alpha or Mask) or a device color space channel. |
| An image filter that presents an identical image, just with the colorspace substituted. |
| An image filter that presents a color converted version of an image. The target color space. Must be a base space; i.e., no DeviceN or Indexed spaces. |
| An image filter that presents an image with the edge pixels repeated. Useful for cases where consumers may interpolate pixels at the edge, creating unwanted artifacts. |
| An image filter that presents a downsampled version of an image, using subsample, average or bicubic downsampling. |
| An image filter that presents an image source and color combination as a plain image with an alpha channel, with all pixels colored with the given color. Useful for simplifying an |
| An image filter that presents an image with an Indexed color space as a simple 8-bit image. |
| An image filter that presents an image with a |
| An image filter that merges selected spot components into the process components of an image. This is conceptually similar to
|
| An image filter that presents a bitwise inverted form of the source image. |
| An image filter that removes a Matte and undoes premultiplication for a PDF Matte'd image and soft mask. The resulting image does not have alpha, and can be used with the mask to generate the desired result. |
| An image filter that presents an image as an image with a different bits-per-sample, e.g. converting a 16-bit image to 8-bit. |
| An image filter that presents a masked image where colors within a given range are masked out, analogous to a green screen. The source image must not have a mask or alpha channel. |
| An image filter that applies a PDF/PS style Decode array to the image contents. For details on decode arrays, please see "Decode Arrays" on page 344 of the PDF Reference, version 1.7. The bit depth of the result may be promoted to 8- or 16-bits per component, depending on the situation. |