Hi,
When I load a Jpeg with ImageIO.read(stream); I get a BufferedImage of Type 5:
Example:
[EMAIL PROTECTED]: type = 5 ColorModel: #pixelBits = 24 numComponents = 3 color
space = [EMAIL PROTECTED] transparency = 1 has alpha = false isAlphaPre = false
ByteInterleavedRaster: width = 1700 height = 2550 #numDataElements 3 dataOff[0]
= 2
When I now want to use this Type 5 BufferedImage to perform a Filter-Operation
via:
new ConvolveOp(kernel).filter(src, null);
I get an Error:
Exception in thread "main" java.awt.image.ImagingOpException: Unable to
convolve src image
at java.awt.image.ConvolveOp.filter(ConvolveOp.java:180)
at krachtus.mvc.util.FilterUtils.filterBlur2(FilterUtils.java:24)
at Performance_Image.main(Performance_Image.java:28)
The Point is I have to use a Type 1 BufferedImage to do a successful filtering.
So far I convert the Type 5 into a Type 1 BufferedImage and the filtering works!
My Problem - is a Performance Problem:
The conversion from Type 5 to Type 1 takes very mucht time !!!
Example: I used 10 different jpegs and did the filtering - it takes 20 sec.
when I have to do this conversion. And only 10 sec. with the conversion !!!
Question: Why can't ImageIO.read(...) return a BufferedImage of my choice ? ie.
Type 1 ?
Wild Guess: I think reading the Jpeg as a Type 1 BufferedImage could also be
much faster!
Why ? I use a non-JDK Lib. that returns BufferedImages of Type 1 - it is more
then twice as fast as ImageIO.read() !!!
It may be possible that ImageIO.read() is slower because it is more
time-consuming to generate Type 5 BufferedImage (data is structured
differently) :
Type 5:
[EMAIL PROTECTED]: type = 5 ColorModel: #pixelBits = 24 numComponents = 3 color
space = [EMAIL PROTECTED] transparency = 1 has alpha = false isAlphaPre = false
ByteInterleavedRaster: width = 1700 height = 2550 #numDataElements 3 dataOff[0]
= 2
Type 1:
[EMAIL PROTECTED]: type = 1 DirectColorModel: rmask=ff0000 gmask=ff00 bmask=ff
amask=0 IntegerInterleavedRaster: width = 1700 height = 2550 #Bands = 3 xOff =
0 yOff = 0 dataOffset[0] 0
Type 5: ByteInterleavedRaster
Type 1: IntegerInterleavedRaster
Could their be done some optimization and ImageIO.read() be speed up by
creating a BufferedImage of Type 1 ???
Cheers,
jago
P.S.: How about Acceleration ? Which one is accelerated ? Type 5 or Type 1 ?
Cheers,
jg
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