# How to convert BLOB scaling size into same pixel or percentage to create image in C#.

• ### Question

• Hi Folks,

I am a developer and in one of my project I have used crystal report.

In crystal report I have used BLOB field and I have set Scaling size of this with 15% height and 15% width. Its working as expected with this, it is showing the image appropriately even image is big or small with proper height and width.

Now, I want to create dynamic html string and use the image with same size in C# using html control with img tag, so I just want to know how I can convert the scale size into pixel or percentage using C# to create image or how I can calculate the height and width ,so it will display image same as blob field in C#

Overall, How I can convert the scale size of BLOB field into pixel or percentage using C# code or is their any mechanism to calculate height and width percentage same as blob field.

Wednesday, May 13, 2020 7:03 PM

### All replies

• Hi SANKET VYAS,
According to my understanding, it is not easy to convert BLOB scaling size into same pixel.
And I suggest you scale a image by a specified percentage.
Here is a simple code example you can refer to.

```static Image FixedSize(Image imgPhoto, int Width, int Height)
{
int sourceWidth = imgPhoto.Width;
int sourceHeight = imgPhoto.Height;
int sourceX = 0;
int sourceY = 0;
int destX = 0;
int destY = 0;

float nPercent = 0;
float nPercentW = 0;
float nPercentH = 0;

nPercentW = ((float)Width / (float)sourceWidth);
nPercentH = ((float)Height / (float)sourceHeight);
if (nPercentH < nPercentW)
{
nPercent = nPercentH;
destX = System.Convert.ToInt16((Width - (sourceWidth * nPercent)) / 2);
}
else
{
nPercent = nPercentW;
destY = System.Convert.ToInt16((Height - (sourceHeight * nPercent)) / 2);
}

int destWidth = (int)(sourceWidth * nPercent);
int destHeight = (int)(sourceHeight * nPercent);

Bitmap bmPhoto = new Bitmap(Width, Height, PixelFormat.Format24bppRgb);
//Sets the resolution for this Bitmap.
bmPhoto.SetResolution(imgPhoto.HorizontalResolution,imgPhoto.VerticalResolution);
//Creates a new Graphics
Graphics grPhoto = Graphics.FromImage(bmPhoto);
//Clears the entire drawing surface and fills it with the specified background color.
grPhoto.Clear(Color.Red);
grPhoto.InterpolationMode =InterpolationMode.HighQualityBicubic;
//Draws the specified Image at the specified location and with the original size.
grPhoto.DrawImage(imgPhoto,new Rectangle(destX, destY, destWidth, destHeight), new Rectangle(sourceX, sourceY, sourceWidth, sourceHeight), GraphicsUnit.Pixel);
grPhoto.Dispose();
return bmPhoto;
}```

Here are some related documents you can refer to.
[c# Image resizing to different size while preserving aspect ratio]
[Resize image with percentage value in C#]
Hope these are helpful to you.
Best Regards,
Daniel Zhang

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Friday, May 29, 2020 2:13 AM