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2008.01.14 12:02 "=?gb2312?q?=BB=D8=B8=B4=A3=BA=20RE:=20[Tiff]=20TIFFWriteScanline=20-=20wr?= =?gb2312?q?ite=20band=20orders?=", by Gis Geo
Thanks Rob.
Basically in the filter output, I wish to copy the same buffer from the 2nd
row (j=1) to the 1st row (j=0), and copy the buffer from the last second row
(j=height-2) to the last row (j=height-1). During the data read, I used this
for (j = 1; j < height-1; j++)
{
...
}
to omit the read of the first row (j=0) and the last row (j=height-1), using
other buffer variables. From this loop, j will never reach j=height-1.
I feel the code I included in the post does make a complete buffer write,
from j=0 to j=height-1.
TIM
"Tillaart, Rob van den" <rob.vandentillaart@oce.com> дµÀ£º Hi
Think the error is in the line
if (j ==height-2 )
It should be
if (j == height-1)
as otherwise the last line (j==height) isn't wriiten.
give it a try
rob
---------------------------------
From: tiff-bounces@lists.maptools.org
[mailto:tiff-bounces@lists.maptools.org] On Behalf Of gis geo
Sent: maandag 14 januari 2008 7:33
To: tiff@lists.maptools.org
Subject: [Tiff] TIFFWriteScanline - write band orders
Hi All,
I am learning and testing TIFF Lib, and have experienced the following
problem:
I wish to write a 16-bit RGB imagery with separate planes, using the
following codes
...
TIFFSetField(out, TIFFTAG_IMAGEWIDTH, width);
TIFFSetField(out, TIFFTAG_IMAGELENGTH, height);
TIFFSetField(out, TIFFTAG_BITSPERSAMPLE, 16);
TIFFSetField(out, TIFFTAG_SAMPLESPERPIXEL, 3);
TIFFSetField(out, TIFFTAG_PLANARCONFIG, 2);
TIFFSetField(out, TIFFTAG_PHOTOMETRIC, 2);
TIFFSetField(out, TIFFTAG_COMPRESSION, COMPRESSION_NONE);
TIFFSetField(out, TIFFTAG_ROWSPERSTRIP, TIFFDefaultStripSize(out,
1));
for (j = 0; j < height; j++)
{
...
TIFFWriteScanline(out, buf_r, j, 0);
TIFFWriteScanline(out, buf_g, j, 1);
TIFFWriteScanline(out, buf_b, j, 2);
}
The output is fine and works. I can verify that.
But, after I have applied a 3*3 filter analysis, and I wish to output the
same row-by-row data in this form, and the output tiff file is wrong:
for (j = 1; j < height-1; j++)
{
...
if (j ==1 )
{
TIFFWriteScanline(out, buf_r, j-1, 0);
TIFFWriteScanline(out, buf_g, j-1, 1);
TIFFWriteScanline(out, buf_b, j-1, 2);
}
TIFFWriteScanline(out, buf_r, j, 0);
TIFFWriteScanline(out, buf_g, j, 1);
TIFFWriteScanline(out, buf_b, j, 2);
if (j ==height-2 )
{
TIFFWriteScanline(out, buf_r, j+1, 0);
TIFFWriteScanline(out, buf_g, j+1, 1);
TIFFWriteScanline(out, buf_b, j+1, 2);
}
}
I could not figure out why. This might to related to TIFFWriteScanline()
and some expectation from the Tiff Lib that I did not specify.
THANK you in advance.
---------------------------------
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