It is a multi-strip image and my code handles multi-strip images of
Group 4 compression fine. In fact, that link you sent was a response to
an older question I had (to get the multi-strip Group 4 compression
working). I was able to figure everything out from what you provided
last time. I now have a method that works with most of the TIFF image
types I have to deal with, except the Group 3 compression. I run it
through the debugger and it seems to be working fine (building the
images from the strips), but the PDF is virtually empty that it creates.
My method that deals with the TIFFS is below. Any thoughts where the
problem is would be appreciated.
public void addPage(String imagePath) throws IOException {
File inputFile = new File(imagePath);
try {
SeekableStream s = new FileSeekableStream(inputFile);
TIFFDirectory dir = new TIFFDirectory(s, 0);
long IFDOffset = dir.getIFDOffset();
while (IFDOffset != 0L) {
dir = new TIFFDirectory(s, IFDOffset, 0);
IFDOffset = dir.getNextIFDOffset();
long type = -1;
if
(dir.isTagPresent(TIFFImageDecoder.TIFF_RESOLUTION_UNIT)) {
type =
dir.getFieldAsLong(TIFFImageDecoder.TIFF_RESOLUTION_UNIT);
if (type != 2) {
System.err.println("Wrong format! Size not in
inches.");
}
}
float xres =
dir.getFieldAsFloat(TIFFImageDecoder.TIFF_X_RESOLUTION);
float yres =
dir.getFieldAsFloat(TIFFImageDecoder.TIFF_Y_RESOLUTION);
long h =
dir.getFieldAsLong(TIFFImageDecoder.TIFF_IMAGE_LENGTH);
long w =
dir.getFieldAsLong(TIFFImageDecoder.TIFF_IMAGE_WIDTH);
height = (int) h;
width = (int) w;
float scaledHeight = h / (yres / 72f);
float scaledWidth = w / (xres / 72f);
document.setPageSize(new Rectangle(scaledWidth,
scaledHeight));
long rowsStrip =
dir.getFieldAsLong(TIFFImageDecoder.TIFF_ROWS_PER_STRIP);
TIFFField field =
dir.getField(TIFFImageDecoder.TIFF_STRIP_OFFSETS);
long offset[];
if (field.getType() == TIFFField.TIFF_LONG) {
offset = field.getAsLongs();
} else {
// must be short
short temp[] = field.getAsShorts();
offset = new long[temp.length];
for (int k = 0; k < temp.length; ++k) {
offset[k] = temp[k];
}
}
field =
dir.getField(TIFFImageDecoder.TIFF_STRIP_BYTE_COUNTS);
long size[];
if (field.getType() == TIFFField.TIFF_LONG) {
size = field.getAsLongs();
} else {
// must be short
short temp[] = field.getAsShorts();
size = new long[temp.length];
for (int k = 0; k < temp.length; ++k) {
size[k] = temp[k];
}
}
boolean reverse = false;
if (dir.isTagPresent(TIFFImageDecoder.TIFF_FILL_ORDER))
{
reverse =
(dir.getFieldAsLong(TIFFImageDecoder.TIFF_FILL_ORDER) == 2L);
}
int compression = (int)
dir.getFieldAsLong(TIFFImageDecoder.TIFF_COMPRESSION);
switch (compression) {
case TIFFImage.COMP_NONE:
throw new IOException("Images without
compression are not supported by iCris.");
case TIFFImage.COMP_FAX_G3_1D:
compression = Image.CCITTG3_1D;
break;
case TIFFImage.COMP_FAX_G3_2D:
compression = Image.CCITTG3_1D;
if
(dir.isTagPresent(TIFFImageDecoder.TIFF_T4_OPTIONS)) {
if (((int)
dir.getFieldAsLong(TIFFImageDecoder.TIFF_T4_OPTIONS) & 1) != 0) {
compression = Image.CCITTG3_2D;
}
}
break;
case TIFFImage.COMP_FAX_G4_2D:
compression = Image.CCITTG4;
break;
default:
throw new IOException("Compression type " +
compression + " not supported");
}
// Check if we need to create a new page
if (constructedSecond) {
document.newPage();
} else {
constructedSecond = true;
if (useImageMask) {
singleMask =
Image.getInstance(Toolkit.getDefaultToolkit().createImage(imageMaskPath)
, null);
}
}
long rowsLeft = h;
float totatHeight = 0;
float scaleX = 72f / xres * 100;
float scaleY = 72f / yres * 100;
document.open();
PdfContentByte cb = writer.getDirectContent();
for (int k = 0; k < offset.length; ++k) {
byte im[] = new byte[(int) size[k]];
s.seek(offset[k]);
s.readFully(im);
Image img = Image.getInstance((int) w, (int)
Math.min(rowsStrip, rowsLeft), reverse, compression, 0, im);
rowsLeft -= rowsStrip;
img.scalePercent(scaleX, scaleY);
totatHeight += (float) scaleY / 100 * img.height();
img.setAbsolutePosition(0, scaledHeight -
totatHeight);
cb.addImage(img);
}
}
} catch (DocumentException e) {
e.printStackTrace();
} catch (IOException ex) {
try {
document.open();
document.close();
} finally {
new File(pdfPath).delete();
}
throw ex;
}
}
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Paulo
Soares
Sent: Friday, March 14, 2003 11:55 AM
To: 'Aaron Kelley'; [EMAIL PROTECTED]
Subject: RE: [iText-questions] Group 3 TIFF compression
It's probably a multi-strip image. See
http://www.mail-archive.com/[EMAIL PROTECTED]/msg041
82
Best Regards,
Paulo Soares
> -----Original Message-----
> From: Aaron Kelley [SMTP:[EMAIL PROTECTED]
> Sent: Friday, March 14, 2003 18:43
> To: [EMAIL PROTECTED]
> Subject: [iText-questions] Group 3 TIFF compression
>
> I have a tiff with Group 3 compression and I am having trouble putting
the
> image into a PDF with iText. I have a piece of code to detect the
> compression (similar to Chap0612.java) and it is coming up as
compression
> = Image.CCITTG3_1D;
>
> The PDF is being generated basically blank (very small file size
compared
> to the image). I have this code working with all kinds of different
TIFF
> formats, but I cannot seem to get it to work for Group 3. Also, the
> examples (Chap0611 and Chap0612) fail to create a PDF from this image.
> Any ideas?
>
> Aaron Kelley | Software Developer
> Tyler Technologies | Eagle Division
>
> Phone: 303.249.1821
> Email: [EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
>
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