How to scale a bitmap without antialiasing











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Creating a Bitmap that is really small (3 x 6 in this case). I need to display it in a picture box without antialiasing. Here is how I am scaling now:



image = new System.Drawing.Bitmap(image, image.Width * 10, image.Height * 10);


The resulting image is very munged:



enter image description here



The image is built using 0 - 255 RGB using the data below:



  2 |  1 |
2 | 12 |
1 | 16 |
3 | 5 |
2 | 6 |
3 | 4 |


The pixel color is set by making the highest number (16) = 255, 255,2555 with zero being 0,0,0 or black.



Full code:



        public System.Drawing.Bitmap SliceBMP(Slice s, Axis axis = Axis.x)
{
s = CheckSlice(s);
int max = GetMaxCount(s);
System.Drawing.Bitmap image = new System.Drawing.Bitmap(s.ZEnd - s.ZBegin + 1, s.YEnd-s.YBegin+1 );
switch (axis)
{
case Axis.x:
for (int b = s.YBegin; b <= s.YEnd; b++)
{
for (int c = s.ZBegin; c <= s.ZEnd; c++)
{
double count = (double)_grid[s.XBegin][b][c].Count;
int color = (int)((count / max)*500.0);
if(color > 255)
{
color = 255;
}
image.SetPixel(
c - s.ZBegin,
s.YEnd - b,
System.Drawing.Color.FromArgb(color, color, color)
);

}
}
break;

}
image = new System.Drawing.Bitmap(image, image.Width * 10, image.Height * 10);
return image;
}


Where it's called:



        pictureBox1.Image = sliceImage;
pictureBox1.Width = sliceImage.Width;
pictureBox1.Height = sliceImage.Height;
pictureBox1.Refresh();









share|improve this question


















  • 2




    Better use DrawImage and g.InterpolationMode = InterpolationMode.NearestNeighbor; g.PixelOffsetMode = PixelOffsetMode.Half;. Built-in scaling will always try to make it nice even when you don't want it..
    – TaW
    Nov 11 at 8:15












  • Or just keep your image small and zoom it on the PictureBox. The note on PixelOffsetMode given by TaW still applies, though.
    – Nyerguds
    Nov 13 at 14:07

















up vote
-1
down vote

favorite












Creating a Bitmap that is really small (3 x 6 in this case). I need to display it in a picture box without antialiasing. Here is how I am scaling now:



image = new System.Drawing.Bitmap(image, image.Width * 10, image.Height * 10);


The resulting image is very munged:



enter image description here



The image is built using 0 - 255 RGB using the data below:



  2 |  1 |
2 | 12 |
1 | 16 |
3 | 5 |
2 | 6 |
3 | 4 |


The pixel color is set by making the highest number (16) = 255, 255,2555 with zero being 0,0,0 or black.



Full code:



        public System.Drawing.Bitmap SliceBMP(Slice s, Axis axis = Axis.x)
{
s = CheckSlice(s);
int max = GetMaxCount(s);
System.Drawing.Bitmap image = new System.Drawing.Bitmap(s.ZEnd - s.ZBegin + 1, s.YEnd-s.YBegin+1 );
switch (axis)
{
case Axis.x:
for (int b = s.YBegin; b <= s.YEnd; b++)
{
for (int c = s.ZBegin; c <= s.ZEnd; c++)
{
double count = (double)_grid[s.XBegin][b][c].Count;
int color = (int)((count / max)*500.0);
if(color > 255)
{
color = 255;
}
image.SetPixel(
c - s.ZBegin,
s.YEnd - b,
System.Drawing.Color.FromArgb(color, color, color)
);

}
}
break;

}
image = new System.Drawing.Bitmap(image, image.Width * 10, image.Height * 10);
return image;
}


Where it's called:



        pictureBox1.Image = sliceImage;
pictureBox1.Width = sliceImage.Width;
pictureBox1.Height = sliceImage.Height;
pictureBox1.Refresh();









share|improve this question


















  • 2




    Better use DrawImage and g.InterpolationMode = InterpolationMode.NearestNeighbor; g.PixelOffsetMode = PixelOffsetMode.Half;. Built-in scaling will always try to make it nice even when you don't want it..
    – TaW
    Nov 11 at 8:15












  • Or just keep your image small and zoom it on the PictureBox. The note on PixelOffsetMode given by TaW still applies, though.
    – Nyerguds
    Nov 13 at 14:07















up vote
-1
down vote

favorite









up vote
-1
down vote

favorite











Creating a Bitmap that is really small (3 x 6 in this case). I need to display it in a picture box without antialiasing. Here is how I am scaling now:



image = new System.Drawing.Bitmap(image, image.Width * 10, image.Height * 10);


The resulting image is very munged:



enter image description here



The image is built using 0 - 255 RGB using the data below:



  2 |  1 |
2 | 12 |
1 | 16 |
3 | 5 |
2 | 6 |
3 | 4 |


The pixel color is set by making the highest number (16) = 255, 255,2555 with zero being 0,0,0 or black.



Full code:



        public System.Drawing.Bitmap SliceBMP(Slice s, Axis axis = Axis.x)
{
s = CheckSlice(s);
int max = GetMaxCount(s);
System.Drawing.Bitmap image = new System.Drawing.Bitmap(s.ZEnd - s.ZBegin + 1, s.YEnd-s.YBegin+1 );
switch (axis)
{
case Axis.x:
for (int b = s.YBegin; b <= s.YEnd; b++)
{
for (int c = s.ZBegin; c <= s.ZEnd; c++)
{
double count = (double)_grid[s.XBegin][b][c].Count;
int color = (int)((count / max)*500.0);
if(color > 255)
{
color = 255;
}
image.SetPixel(
c - s.ZBegin,
s.YEnd - b,
System.Drawing.Color.FromArgb(color, color, color)
);

}
}
break;

}
image = new System.Drawing.Bitmap(image, image.Width * 10, image.Height * 10);
return image;
}


Where it's called:



        pictureBox1.Image = sliceImage;
pictureBox1.Width = sliceImage.Width;
pictureBox1.Height = sliceImage.Height;
pictureBox1.Refresh();









share|improve this question













Creating a Bitmap that is really small (3 x 6 in this case). I need to display it in a picture box without antialiasing. Here is how I am scaling now:



image = new System.Drawing.Bitmap(image, image.Width * 10, image.Height * 10);


The resulting image is very munged:



enter image description here



The image is built using 0 - 255 RGB using the data below:



  2 |  1 |
2 | 12 |
1 | 16 |
3 | 5 |
2 | 6 |
3 | 4 |


The pixel color is set by making the highest number (16) = 255, 255,2555 with zero being 0,0,0 or black.



Full code:



        public System.Drawing.Bitmap SliceBMP(Slice s, Axis axis = Axis.x)
{
s = CheckSlice(s);
int max = GetMaxCount(s);
System.Drawing.Bitmap image = new System.Drawing.Bitmap(s.ZEnd - s.ZBegin + 1, s.YEnd-s.YBegin+1 );
switch (axis)
{
case Axis.x:
for (int b = s.YBegin; b <= s.YEnd; b++)
{
for (int c = s.ZBegin; c <= s.ZEnd; c++)
{
double count = (double)_grid[s.XBegin][b][c].Count;
int color = (int)((count / max)*500.0);
if(color > 255)
{
color = 255;
}
image.SetPixel(
c - s.ZBegin,
s.YEnd - b,
System.Drawing.Color.FromArgb(color, color, color)
);

}
}
break;

}
image = new System.Drawing.Bitmap(image, image.Width * 10, image.Height * 10);
return image;
}


Where it's called:



        pictureBox1.Image = sliceImage;
pictureBox1.Width = sliceImage.Width;
pictureBox1.Height = sliceImage.Height;
pictureBox1.Refresh();






c# bitmap scale






share|improve this question













share|improve this question











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asked Nov 11 at 0:34









Eric Snyder

14718




14718








  • 2




    Better use DrawImage and g.InterpolationMode = InterpolationMode.NearestNeighbor; g.PixelOffsetMode = PixelOffsetMode.Half;. Built-in scaling will always try to make it nice even when you don't want it..
    – TaW
    Nov 11 at 8:15












  • Or just keep your image small and zoom it on the PictureBox. The note on PixelOffsetMode given by TaW still applies, though.
    – Nyerguds
    Nov 13 at 14:07
















  • 2




    Better use DrawImage and g.InterpolationMode = InterpolationMode.NearestNeighbor; g.PixelOffsetMode = PixelOffsetMode.Half;. Built-in scaling will always try to make it nice even when you don't want it..
    – TaW
    Nov 11 at 8:15












  • Or just keep your image small and zoom it on the PictureBox. The note on PixelOffsetMode given by TaW still applies, though.
    – Nyerguds
    Nov 13 at 14:07










2




2




Better use DrawImage and g.InterpolationMode = InterpolationMode.NearestNeighbor; g.PixelOffsetMode = PixelOffsetMode.Half;. Built-in scaling will always try to make it nice even when you don't want it..
– TaW
Nov 11 at 8:15






Better use DrawImage and g.InterpolationMode = InterpolationMode.NearestNeighbor; g.PixelOffsetMode = PixelOffsetMode.Half;. Built-in scaling will always try to make it nice even when you don't want it..
– TaW
Nov 11 at 8:15














Or just keep your image small and zoom it on the PictureBox. The note on PixelOffsetMode given by TaW still applies, though.
– Nyerguds
Nov 13 at 14:07






Or just keep your image small and zoom it on the PictureBox. The note on PixelOffsetMode given by TaW still applies, though.
– Nyerguds
Nov 13 at 14:07



















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