Solved

rgb values change randomly?! TImage?! TBitmap?!

Posted on 2001-06-25
4
167 Views
Last Modified: 2010-04-06
hi,

i'm making a simple colouring program. the program uses a colorbar i made myself. the colorbar consists of 39 rgb colors.

i've filled a simple black & white picture with some colors (using floodfill). now comes the trickiest part..
i've loaded the original black and white picture in a TImage(image1). and i've loaded the painted picture in another TImage(image2). Now, when i try to color the original picture, my program checks if the color i'm using is the same as the color i used before (and that is now on image2).

i'm using canvas.pixels[x,y] to determine to color of the pixel at [x,y] on image2 and i compare it with the current brush color i'm about to use.

in some cases the colors match and that's, cuz that's what i want. but in a lot of cases the colors differ a little. e.g. color about to be used on image1 = rgb(130,189,140) while the original color(image2) = rgb(130,187,139). this doesnt match, thus is wrong.

the essence of the program is, that a color can only be used when it matches. remember i'm only using the 39 colors.

it's very frustating...

thanks in advance
0
Comment
Question by:brutebass
  • 2
  • 2
4 Comments
 
LVL 5

Accepted Solution

by:
TheNeil earned 100 total points
ID: 6224246
What pixel format are you using? Try setting the pixel format for your two images to be 24 bit:

Image1.Picture.Bitmap.PixelFormat := pf24Bit;

If you're using a 256 colour bitmap or your screen depth isn'y 24 bit then WIndows will either dither the colour (not likely) or go for a close approximation, and it's this that's causing your colour values to differ slightly

The Neil =:)
0
 

Author Comment

by:brutebass
ID: 6224280
both images are already 24bit images. and the timage controls are already set to pf24bit. didnt fix my problem...
0
 

Author Comment

by:brutebass
ID: 6224313
it did fix my problem..hehe ... forgot one thing to test...
thanks man!
0
 
LVL 5

Expert Comment

by:TheNeil
ID: 6224546
Anytime

The Neil =:)
0

Featured Post

Simplifying Server Workload Migrations

This use case outlines the migration challenges that organizations face and how the Acronis AnyData Engine supports physical-to-physical (P2P), physical-to-virtual (P2V), virtual to physical (V2P), and cross-virtual (V2V) migration scenarios to address these challenges.

Question has a verified solution.

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

Suggested Solutions

This article explains how to create forms/units independent of other forms/units object names in a delphi project. Have you ever created a form for user input in a Delphi project and then had the need to have that same form in a other Delphi proj…
Creating an auto free TStringList The TStringList is a basic and frequently used object in Delphi. On many occasions, you may want to create a temporary list, process some items in the list and be done with the list. In such cases, you have to…
Along with being a a promotional video for my three-day Annielytics Dashboard Seminor, this Micro Tutorial is an intro to Google Analytics API data.
Nobody understands Phishing better than an anti-spam company. That’s why we are providing Phishing Awareness Training to our customers. According to a report by Verizon, only 3% of targeted users report malicious emails to management. With compan…

770 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