Planet PDF Forum Archive

Planet PDF ForumWowsers! This is page is old, head to the LIVE Planet PDF Forum. It features more than 10 conferences, covering everything from beginner to in-depth developer and pre-press discussions. If you wish to continue... one & two archive covers 1999-2011 (160,000 pages).


New Forum | Previous | Next | (P-PDF) Developers


Topic: 4 bit Indexed CalRGB
Conf: (P-PDF) Developers, Msg: 91663
From: stevephils
Date: 7/8/2003 11:13 PM

Hi PDF Gurus,
I'm in a process of converting the image into BMP format and able to do the conversions of some Color Spaces(DeviceRGB,GrayScale,CMYK,....) without much hassle.Now I start looking into Indexed color space.I suppose the indexed color space(CalRGB) is a flavour of Windows BMP format(Correct me if not).I'm able to convert the 8 BitsPerComponent Indexed CalRGB image into BMP very easily.

Currently I struck with 4 BitsPerComponent image.What I'm planning in case of 4 bit is to just insert the color look up table value into the bmiColors of bitmap data.
And also the image data stream need to be WordAligned in case of BMP.Row-by-Row I'm creating the word aligned buffer.The output buffer size for BMP is calculating using the Width Byte formula ie (((Bits) + 31) / 32 * 4).
Here is the area I need the help.What should be the input buffer size .I'm taking the input buffer size as
((Width + 1) >> 1) ,since data is something roughly on the order of Width/2..I think this is not correct.I'm not getting the output correctly .
I like to get clarified on this.What about the Byte boundaries issue when the size of width is odd in PDF?.Another is what would be the bits per pixel value in case of 4 bitspercomponents?

TIA!


PDF In-Depth Free Product Trials Ubiquitous PDF

Debenu Aerialist

The ultimate plug-in for Adobe Acrobat. Advanced splitting, merging, stamping, bookmarking, and link...

Download free demo

Debenu PDF Tools Pro

It's simple to use and will let you preview and edit PDF files, it's a Windows application that makes...

Download free demo

Back to the past, 15 years ago! Open Publish 2002

Looking back to 2002, it's amazing how much of the prediction became a reality. Take a read and see what you think!

September 14, 2017
Platinum Sponsor





Search Planet PDF
more searching options...
Planet PDF Newsletter
Most Popular Articles
Featured Product

Debenu PDF Aerialist

The ultimate plug-in for Adobe Acrobat. Advanced splitting, merging, stamping, bookmarking, and link control. Take Acrobat to the next level.

Features

Adding a PDF Stamp Comment

OK, so you want to stamp your document. Maybe you need to give reviewers some advice about the document's status or sensitivity. This tip from author Ted Padova demonstrates how to add stamps with the Stamp Tool along with related comments.