Solved

Source code for converting jpg to bmp

Posted on 2000-02-17
6
313 Views
Last Modified: 2013-11-19
I'm looking for source code for
converting from jpg & gif image file to black & white bmp file.

(Windows NT & jdk 1.1.8, or c++)

I need your help.
Thanks in advance.
:>)
0
Comment
Question by:lmh110697
6 Comments
 
LVL 2

Expert Comment

by:coopa
ID: 2539646
Have a look here for the Jpeg source...

ftp://ftp.uu.net/graphics/jpeg
0
 

Expert Comment

by:TSMITH
ID: 2557243
This is where I get my routines from. I'm in the process of classing my own format load/save, but jpeg is out of my league at present ;) anyhow, hope these help...

http://www.smalleranimals.com/jpegfile.htm

http://www.codeguru.com/bitmap/index.shtml

0
 
LVL 6

Expert Comment

by:edey
ID: 2570282
If you know how to load a jpeg/gif, the easiest method it to blt it to a bmp and save the result :)


As far as converting it to b/w (if it isn't already) you have a couple of options:

1)Let windows do it by creating the bmp with a b/w palette
2)do your own conversion, perhaps something like this (for a 24bit bmp)
  result = sqrt(red*red+green*green+blue*blue)*(255/441)


GL
Mike



GL
Mike
0
Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

 

Expert Comment

by:sunsetyang
ID: 2607700
You can see the source of Delphi 4's jpeg library if you have Delphi.In Delphi3 it was on the cdrom and written in C.You can check.GIF uses LZW coding,You can visit:
http://www.cubic.org/source/archive/fileform/graphic/
to see the coding method.
0
 
LVL 9

Expert Comment

by:ShaunWilde
ID: 2696308
here is how I would do it:

use OleLoadPicture to load the image which can then be rendered using the IPicture interface and the Render method.

Because you can render it to any dc including a memory DC you can then save the image to a BMP

This technique will also work for .gif as well
0
 

Accepted Solution

by:
aegana earned 50 total points
ID: 2709767
Try this page. There is a Delphi implementation of a program that converts images from BMP to JPG (or from JPG to BMP). It also have the source code.

http://www.efg2.com/lab/Graphics/BMPJPG.htm
0

Featured Post

Is Your Active Directory as Secure as You Think?

More than 75% of all records are compromised because of the loss or theft of a privileged credential. Experts have been exploring Active Directory infrastructure to identify key threats and establish best practices for keeping data safe. Attend this month’s webinar to learn more.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Keep your audience engaged and get the most out of your next presentation with these quick Prezi tips.
Many programs have tried to outwit PowerPoint in terms of technology and skill. These programs, however, still lack several characteristics that PowerPoint has possessed from the start. Here's why PowerPoint replacements won't entirely work for desi…
In this second Micro Tutorial in the series,  viewers will learn more basic shortcuts and functions of Illustrator. In this tutorial you will learn about the eyedropper tool, zoom , ellipses and more.
In this Micro Tutorial viewers will learn the basic shortcuts and functions in InDesign.

920 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

11 Experts available now in Live!

Get 1:1 Help Now