Source code for converting jpg to bmp

Posted on 2000-02-17
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.
Question by:lmh110697
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions

Expert Comment

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

Expert Comment

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...


Expert Comment

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)


Free Tool: Port Scanner

Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.


Expert Comment

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:
to see the coding method.

Expert Comment

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

Accepted Solution

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.

Featured Post

[Webinar] Learn How Hackers Steal Your Credentials

Do You Know How Hackers Steal Your Credentials? Join us and Skyport Systems to learn how hackers steal your credentials and why Active Directory must be secure to stop them. Thursday, July 13, 2017 10:00 A.M. PDT

Question has a verified solution.

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

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…
Technology opened people to different means of presenting information, but PowerPoint remains to be above competition. Know why PPT still works today.
Learn how to set up basic frames and paths in Prezi and understand the open space that Prezi allows you to create presentations in.
Learn how to create interesting presentations by including videos to keep your audience engaged using Prezi. Select "Insert" from the top menu in your Prezi editor: Select "YouTube Video": Paste the video URL into the prompt: "Select "Insert":…
Suggested Courses

631 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