如何更改图片的大小 [英] How to Change Size of Image
问题描述
我从CameraCaptureTask得到一个形象,我希望能够在保存之前,使图像更小。宽度和高度自动设置为最高分辨率,这比什么,我需要更多。我一直在试图获取图像,更改尺寸,然后尝试保存,但我得到的错误。
原始
MainPage.xaml.cs中
私人无效cameraTask_Completed(对象发件人,PhotoResult E)
{
如果(e.TaskResult == TaskResult.OK)
{
的BitmapImage BMI =新的BitmapImage();
bmi.SetSource(e.ChosenPhoto);
//MessageBox.Show(bmi.PixelWidth.ToString()+×+ bmi.PixelHeight.ToString());
VAR GCD = GCD(bmi.PixelWidth,bmi.PixelHeight);
VAR的结果=的String.Format({0}:{1},bmi.PixelWidth / GCD,bmi.PixelHeight / GCD);
WriteableBitmap的WB;
涧流;
开关(结果)
{
案3:4:
WB =新的WriteableBitmap的(480640);
中断;
案4:3:
WB =新WriteableBitmap的(640,480);
中断;
案9:16:
WB =新的WriteableBitmap的(448,800);
中断;
案16:9:
WB =新的WriteableBitmap的(800,448);
中断;
默认:
WB = NULL;
的回报;
}
//设置白平衡原来的流?
wb.SetSource(e.ChosenPhoto);
//将WB到流保存
=流新的MemoryStream(wb.ToByteArray());
//需要更换新图像流以下行保存?
// VAR capturedPicture =新CapturedPicture(e.OriginalFileName,e.ChosenPhoto);
变种capturedPicture =新CapturedPicture(e.OriginalFileName,流);
}
}
公众诠释GCD(INT A,INT B)
{
,而(A = 0&安培;!&放;!b = 0)
{
如果(A> b)
A%= b;
,否则
B%= A;
}
如果(A == 0)
回复B;
,否则
返回;
}
编辑:新实施
私人无效cameraTask_Completed(对象发件人,PhotoResult E)
{
如果(e.TaskResult == TaskResult.OK)
{
BitmapImage的BMI =新的BitmapImage();
bmi.SetSource(e.ChosenPhoto);
VAR GCD = GCD(bmi.PixelWidth,bmi.PixelHeight);
VAR的结果=的String.Format({0}:{1},bmi.PixelWidth / GCD,bmi.PixelHeight / GCD);
WriteableBitmap的WB =新的WriteableBitmap的(BMI);
流流=新的MemoryStream();
开关(结果)
{
案3:4:
wb.SaveJpeg(流,480,640,0,100);
中断;
案4:3:
wb.SaveJpeg(流,640,480,0,100);
中断;
案9:16:
wb.SaveJpeg(流,448,800,0,100);
中断;
案16:9:
wb.SaveJpeg(流,800,448,0,100);
中断;
默认:
WB = NULL;
的回报;
}
stream.Seek(0,SeekOrigin.Begin);
// VAR capturedPicture =新CapturedPicture(e.OriginalFileName,e.ChosenPhoto);
变种capturedPicture =新CapturedPicture(e.OriginalFileName,流);
使用重载的位图构造函数创建一个重新大小形象,你唯一缺少的是一个投回的图像数据类型:
公共静态图像resizeImage(图片imgToResize,尺寸大小)
{
回报(图)(新位图(imgToResize,大小));
}
yourImage = resizeImage(yourImage,新的尺寸(50,50));
I am getting an image from the CameraCaptureTask, and I would like to be able to make the image much smaller before saving. The width and height are automatically set to the highest resolution, which is much more than what I need. I have been trying to get the image, change the dimensions, and then attempt to save, although I am getting errors.
ORIGINAL
MainPage.xaml.cs
private void cameraTask_Completed(object sender, PhotoResult e)
{
if (e.TaskResult == TaskResult.OK)
{
BitmapImage bmi = new BitmapImage();
bmi.SetSource(e.ChosenPhoto);
//MessageBox.Show(bmi.PixelWidth.ToString() + "x" + bmi.PixelHeight.ToString());
var gcd = GCD(bmi.PixelWidth, bmi.PixelHeight);
var result = string.Format("{0}:{1}", bmi.PixelWidth / gcd, bmi.PixelHeight / gcd);
WriteableBitmap wb;
Stream stream;
switch (result)
{
case "3:4":
wb = new WriteableBitmap(480,640);
break;
case "4:3":
wb = new WriteableBitmap(640,480);
break;
case "9:16":
wb = new WriteableBitmap(448, 800);
break;
case "16:9":
wb = new WriteableBitmap(800, 448);
break;
default:
wb = null;
return;
}
//Set the wb to the original stream?
wb.SetSource(e.ChosenPhoto);
//Convert the wb to a stream for saving
stream = new MemoryStream(wb.ToByteArray());
//Need to replace the following line with the new image stream for saving?
//var capturedPicture = new CapturedPicture(e.OriginalFileName, e.ChosenPhoto);
var capturedPicture = new CapturedPicture(e.OriginalFileName, stream);
}
}
public int GCD(int a, int b)
{
while (a != 0 && b != 0)
{
if (a > b)
a %= b;
else
b %= a;
}
if (a == 0)
return b;
else
return a;
}
EDIT: new implementation
private void cameraTask_Completed(object sender, PhotoResult e)
{
if (e.TaskResult == TaskResult.OK)
{
BitmapImage bmi = new BitmapImage();
bmi.SetSource(e.ChosenPhoto);
var gcd = GCD(bmi.PixelWidth, bmi.PixelHeight);
var result = string.Format("{0}:{1}", bmi.PixelWidth / gcd, bmi.PixelHeight / gcd);
WriteableBitmap wb = new WriteableBitmap(bmi);
Stream stream = new MemoryStream();
switch (result)
{
case "3:4":
wb.SaveJpeg(stream, 480, 640, 0, 100);
break;
case "4:3":
wb.SaveJpeg(stream, 640, 480, 0, 100);
break;
case "9:16":
wb.SaveJpeg(stream, 448, 800, 0, 100);
break;
case "16:9":
wb.SaveJpeg(stream, 800, 448, 0, 100);
break;
default:
wb = null;
return;
}
stream.Seek(0, SeekOrigin.Begin);
//var capturedPicture = new CapturedPicture(e.OriginalFileName, e.ChosenPhoto);
var capturedPicture = new CapturedPicture(e.OriginalFileName, stream);
use the overloaded Bitmap constructor to create a re-sized image, the only thing you were missing was a cast back to the Image data type:
public static Image resizeImage(Image imgToResize, Size size)
{
return (Image)(new Bitmap(imgToResize, size));
}
yourImage = resizeImage(yourImage, new Size(50,50));
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