後來想到有一個名詞上網找了一下
可交換圖檔格式常被簡稱為Exif（Exchangeable image file format）
裡面有個選項是圖像方向於是找了發現非標準
想說是否能抓取EXif取得圖片轉的方向然後將圖片轉回來
很幸運的網路已經有人寫過將之修改
if (file != null && file.Count() > 0)
{
foreach (var item in file)
{
if (item != null)
{
//轉成圖片
System.Drawing.Image img = System.Drawing.Image.FromStream(item.InputStream);
//取得旋轉度數
foreach (var prop in img.PropertyItems)
{
if (prop.Id == 0x0112) //value of EXIF
{
int orientationValue = img.GetPropertyItem(prop.Id).Value[0];
RotateFlipType rotateFlipType = GetOrientationToFlipType(orientationValue);//取得轉的度數
img.RotateFlip(rotateFlipType);//依度數轉成正的
break;
}
}
//處理圖片 轉二進位 或存到路徑上
//byte[] byteImage = imageToByteArray(img);//轉二進位
//img.Save.....
}
}
}
public static RotateFlipType GetOrientationToFlipType(int orientationValue)
{
RotateFlipType rotateFlipType = RotateFlipType.RotateNoneFlipNone;
switch (orientationValue)
{
case 1:
rotateFlipType = RotateFlipType.RotateNoneFlipNone;
break;
case 2:
rotateFlipType = RotateFlipType.RotateNoneFlipX;
break;
case 3:
rotateFlipType = RotateFlipType.Rotate180FlipNone;
break;
case 4:
rotateFlipType = RotateFlipType.Rotate180FlipX;
break;
case 5:
rotateFlipType = RotateFlipType.Rotate90FlipX;
break;
case 6:
rotateFlipType = RotateFlipType.Rotate90FlipNone;
break;
case 7:
rotateFlipType = RotateFlipType.Rotate270FlipX;
break;
case 8:
rotateFlipType = RotateFlipType.Rotate270FlipNone;
break;
default:
rotateFlipType = RotateFlipType.RotateNoneFlipNone;
break;
}
return rotateFlipType;
}
參考來源EXIF
Reset Image Orientation using EXIF in C#
