Brightness

Hi i have a problem executing a loop to change the brightness of an image

i have all the colour pixels and everytime the trackerbar moves it will decrease the pixels by 1 - i need to do this from 0 to 255 and vice a versa

can anyone help?

:confused:
Can you post your code so we might be able to help you.

this is what i have soo far

Code:

---

  ProgressBar1->Min = 0;
  ProgressBar1->Max = imgImage->Picture->Bitmap->Height;

  for (int y=0; y < imgImage->Picture->Bitmap->Height; y++)
  {
    for (int x=0; x < imgImage->Picture->Bitmap->Width; x++)
    {
      // Array index in pascal form
      Pixel.Colours = imgImage->Canvas->Pixels[x][y];
      Pixel.Channel.Red = 255;
      Pixel.Channel.Green = 255;
      Pixel.Channel.Blue = 255;
      imgImage->Canvas->Pixels[x][y] = Pixel.Colours;
    }
    ProgressBar1->Position = y;
  }

  imgImage->Repaint();
  ProgressBar1->Position = 0;
}

---

si = gi + brightness

si is the grayscale value of the brightness enhanced image pixel and gi is the original image grayscale pixel value.

Have fun :wave:

well i have tried working on it and have come up with a loop that changes the pixel value when the trackbar is moved

Code:

---

for (int y=0; y < Bitmap->Height; y++)
  {

    for (int x=0; x < Bitmap->Width; x++)
    {
      ImagePixels->Red = TrackBar2->Position;
      ImagePixels->Green = TrackBar2->Position;
      ImagePixels->Blue = TrackBar2->Position;
      ImagePixels++ ;
    }
  }

imgImage->Repaint();

---

but when i look at it i realise im just setting it not continues if you know what i mean

how can i change it so that it will work?

Re-read Deniz's post :D

You need to add/subtract, not just assign.