Thanks for the feedback. There must be something I am missing
though... the raw image properties are 1891 x 1335 pixels.
Ultimately, it should be drawn into a bounding box on my page which
is 378 x 267 points wide (which is a 5:1 pixel-to-point ratio).
I've tried three different approaches:
-Calling image.scaleAbsolute(378, 267)
-Calling image.scalePercent(20)
-Adding the image with no scaling (obviously this doesn't fit all on
the page though)
All three approaches don't display the image as it looks when viewed
using an image viewer.
Interestingly, I downloaded a PDF Explorer to see if I could see how
iText was storing the image. According to the PDF Explorer, it knows
it is 1891 x 1335 pixels. The PDF Explorer also provides an image
viewer panel where you can look at the images individually... in
there, it looks just like it should. It just doesn't display as it
should when drawn on the page. I thought it might be my Acrobat
Reader (v9) but it also looks washed out on my mac using Preview.
I'm stymied... any other thoughts?
Craig
*From:*Bill Ensley [mailto:[email protected]]
*Sent:* Thursday, 19 January 2012 3:22 AM
*To:* Post all your questions about iText here
*Subject:* Re: [iText-questions] Washed out (transparent) image
Hi Craig,
I'm new to this thread, but have quite a bit of experience here.
The math is simple once you wrap your head around it.
Say you have a 3" x 3" box that you want an image in.
At iText measurements, that box will have a (3"x72pt) x (3"x72pt) or
216pt x 216pt size
If you want a screen resolution image, you would need to place a 216
x 216 pixel image into that box.
If you want a print resolution image, you would need a higher
resolution image, say 648 x 648 pixels.
So, short answer, if you are looking for a high quality output, you
need roughly 3 times your bounding box for you pixels.
Hope this helps,
-Bill Ensley
www.bearprinting.com <http://www.bearprinting.com>
On 1/18/2012 5:59 AM, Leonard Rosenthol wrote:
Downsampling is the term for reducing the resolution of an image.
*From: *Craig Edwards <[email protected]
<mailto:[email protected]>>
*Reply-To: *Post here <[email protected]
<mailto:[email protected]>>
*Date: *Tue, 17 Jan 2012 16:51:29 -0800
*To: *Post here <[email protected]
<mailto:[email protected]>>
*Subject: *Re: [iText-questions] Washed out (transparent) image
Umm... sorry for the dumbassery, but how do you mean "downsampling"?
I am merely inserting the image with no scaling... I've tried calling
various combinations of image.scalePercent() based on the DPI ratio
(360 : 72) and image.scaleAbsolute() to set a specific page and it
always appears in the way you suggest.
Thanks.
Craig
*From:*Leonard Rosenthol [mailto:[email protected]]
*Sent:* Tuesday, 17 January 2012 3:15 PM
*To:* Post here
*Subject:* Re: [iText-questions] Washed out (transparent) image
The problem isn't color, it appears that you are downsampling the
resolution and thus losing image data.
Leonard
*From: *Craig Edwards <[email protected]
<mailto:[email protected]>>
*Reply-To: *Post here <[email protected]
<mailto:[email protected]>>
*Date: *Mon, 16 Jan 2012 15:00:30 -0800
*To: *Post here <[email protected]
<mailto:[email protected]>>
*Subject: *Re: [iText-questions] Washed out (transparent) image
Thanks for the reply. I should have mentioned that I had previously
tried that and it doesn't appear to make any difference. For
reference, I've attached what it looks like when calling with
rgbTransparencyBlending=true.
Any other thoughts would be much appreciated. Thanks a lot.
Craig
*From:*Paulo Soares [mailto:[email protected]]
*Sent:* Monday, 16 January 2012 9:17 PM
*To:* Post all your questions about iText here
*Subject:* Re: [iText-questions] Washed out (transparent) image
Call:
PdfWriter.setRgbTransparencyBlending(true);
Paulo
------------------------------------------------------------------------
*From:*Craig Edwards [mailto:[email protected]]
*Sent:* Monday, January 16, 2012 3:46 AM
*To:* [email protected]
<mailto:[email protected]>
*Subject:* [iText-questions] Washed out (transparent) image
Hello fellow iTexters...
One the images that I am embedding in my PDF appears washed out
in the final output. The simplest test case is as follows:
Document doc = new Document(PageSize.A4);
PdfWriter.getInstance(doc, new
FileOutputStream(new File("washout.pdf")));
doc.open();
doc.add(Image.getInstance("checkpoints.png"));
doc.close();
The image appears in the PDF, but the colours are not the same as
if you just view the image directly. Note that I normally scale
the image so that it fits on the page, but I wanted to make the
test case as simple as possible (you can see the problem both
with and without scaling).
I've attached the image and the resulting PDF, and they are also
downloadable from the following URLs in case they don't make it
through:
http://dl.dropbox.com/u/48589982/checkpoints.png
http://dl.dropbox.com/u/48589982/washout.pdf
My initial googling suggests that I may need to set the color
space, but I am not 100% sure if a) that is really the problem
and b) exactly what the sequence of iText APIs I need to call if
it is. Any thoughts/advice would be most welcome. Thanks a lot.
Craig
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is just $99.99! Visual Studio, SharePoint, SQL - plus HTML5, CSS3, MVC3,
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iText(R) is a registered trademark of 1T3XT BVBA.
Many questions posted to this list can (and will) be answered with a reference
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Please check the keywords list before you ask for
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