I need help - I can help - GeoPdf layer image

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GeoPdf layer image

Printed From: Debenu Quick PDF Library - PDF SDK Community Forum
Category: For Users of the Library
Forum Name: I need help - I can help
Forum Description: Problems and solutions while programming with the Debenu Quick PDF Library and Debenu PDF Viewer SDK
URL: http://www.quickpdf.org/forum/forum_posts.asp?TID=1826
Printed Date: 24 Nov 24 at 3:32PM
Software Version: Web Wiz Forums 11.01 - http://www.webwizforums.com

Topic: GeoPdf layer image

Posted By: vinod_pathak
Subject: GeoPdf layer image
Date Posted: 14 May 11 at 9:18AM

hi,

i m using QUICKPDF Library. but i don't know, how to extract image from the geopdf. image present in the form of layer. plz help me.

Thanks & Regards

vinod pathak

Replies:

Posted By: Ingo
Date Posted: 14 May 11 at 10:56AM

Hi Vinod!

Please use the search-functionality (above on the right side).
Try the advanced option
and the searchstring GeoPDF on all forums without time restrictions...
Then you'll get what you need ;-)

Cheers and welcome here,
Ingo

Posted By: vinod_pathak
Date Posted: 14 May 11 at 12:13PM

Hi Ingo

Thanks for your kind response, but i fetch the layers name but how can i get image from these layers.

code:
int lay = pdf.OptionalContentGroupCount();
int lay1=0;
string lay2 = "";
for (int i = 1; i <= lay; i++)
{
lay1 = pdf.GetOptionalContentGroupID(i);
lay2 = pdf.GetOptionalContentGroupName(lay1);
}

Posted By: Ingo
Date Posted: 14 May 11 at 1:45PM

Hi!

Here's a sample how to get images and more out of a pdf:
http://www.quickpdf.org/forum/extract-text-and-images-and-insert-into-new-pdf_topic1308.html
If you need it relevant for special layers you should try ... but i don't think that this is supported by QP.

Cheers, Ingo

Posted By: vinod_pathak
Date Posted: 16 May 11 at 4:59AM

Hi

Thanks for your support.

May be this PDF Created in PHOTOSHOP. when i open this file in Acrobat. 10 layers are shown in the layers view and image attached as a layer.

Thanks & Regards
vinod pathak

Posted By: vinod_pathak
Date Posted: 16 May 11 at 5:06AM

Hi Ingo

link of pdf is : www.terragotech.com/system/files/geopdf/webmap_urbansample.pdf
plz check this pdf

Thanks
vinod pathak

Posted By: Ingo
Date Posted: 16 May 11 at 6:48AM

Hi Vinod!

This here is only a user-user-forum ...
If you know that the image is on the last layer
you can check the layercount using the result
to remove the last layer... with the included image.

Cheers, Ingo

Posted By: vinod_pathak
Date Posted: 16 May 11 at 7:18AM

Hi! Ingo

Thanks for your support. you are doing good task for every one.
In this pdf, image add as a layer.
QUICKPDF Library not able to extract image from the layer so i will try another tool to extract image
from layers in c#.

vinod

Posted By: Ingo
Date Posted: 16 May 11 at 7:20AM

so you should remove the last layer WITH the image ;-)

Posted By: vinod_pathak
Date Posted: 16 May 11 at 7:23AM

how can i remove last layer that is the image layer.

Posted By: Rowan
Date Posted: 16 May 11 at 12:49PM

Vinod, there might be some confusion here between layers and optional content groups. Read this article:

http://help.quickpdflibrary.com/questions/352/what-is-the-difference-between-layers-and-optional-content-groups-ocgs-in-quick - http://help.quickpdflibrary.com/questions/352/what-is-the-difference-between-layers-and-optional-content-groups-ocgs-in-quick

In short: Acrobat uses the term layers, but we use the term optional content groups -- in QPL terminology layers refers to content streams.

The image that you are referring to is part of an optional content group. Despite the order that it is listed in the Acrobat Layers panel, this does not indicate that internally this image is stored in the last optional content group -- that is just a visual representation, but not an accurate representation of the order in which the OCGs are stored.

I will post more info shortly. Just running out of battery on my laptop.

Posted By: Rowan
Date Posted: 16 May 11 at 1:47PM

More info:

It is possible to delete optional content groups, but this will *not* delete the content that was associated with optional content group. Deleting text, image, etc, objects from PDF files is a messy business and so allowing users to delete all content associated with an OCG would result in broken PDF files.

What you will need to do is identify the particular image that you want to remove and then use the ClearImage function to basically delete that image. The image object is not actually deleted though, to prevent the corruption of existing links to the image it will not be deleted from the document. The image will be converted into a 24-bit RGB format consisting of a single transparent pixel.

I hope this helps.

Posted By: Ingo
Date Posted: 16 May 11 at 1:59PM

"...
The image will be converted into a 24-bit RGB format consisting of a single transparent pixel
..."
Tricky and good solution!
I've learned something, too ;-)
Thanks!

Cheers, Ingo