javax.imageio.ImageReader.readRaster(0,null) will read a Raster about
10-20% faster than javax.imageio.ImageReader.read(0) will read a
BufferedImage. Not much unless one intends to do it on the order
of 100 times -- O(2). Which I do intend to do in a tiling applet.
But readRaster() returns a Raster with no ColorModel or ColorSpace
information. The docs say:
/**
* Returns a new Raster object containing the raw pixel data
* from the image stream, without any color conversion applied. The
* application must determine how to interpret the pixel data by other
* means. Any destination or image-type parameters in the supplied
* ImageReadParam object are ignored, but all other
* parameters are used exactly as in the read(}
.
* This method allows formats that normally apply a color
* conversion, such as JPEG, and formats that do not normally have an
* associated colorspace, such as remote sensing or medical imaging data,
* to provide access to raw pixel data.
So that would be ok for my use. I could apply a ColorConvertOp to get the pixel
data into the color space that I wanted.
NOPE!
The only ColorConvertOp that works on Rasters needs a src ColorSpace and a dest
ColorSpace.
public ColorConvertOp(ColorSpace srcCspace,
ColorSpace dstCspace,
RenderingHints hints)
The problem is you can't know what the src ColorSpace is just from inspecting
the Raster returned by readRaster().
So the question:
How do I find out what the ColorSpace is of the Raster returned by readRaster()?
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