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Question

在一些书上介绍的图像翻转以及调节明暗度的方法都是只能作用于BMP格式的图像
怎么样才能对JPG图像有效

Answer 1

JPG转换为BMP再处理，完成后再变会JPG就可以了
例子有很多

Answer 2

function Bmp2JPG(BmpFileName,JPGFileName:string;CompressRate:integer=86):boolean;
将BMP转为JPG,BMP名为BmpFileName,JPG名为JPGFileName,CompressRate为JPG图片的压缩率,若不传入此参数内定为86%压缩率.function JPG2BMP(JPGFileName,BmpFileName:string):boolean;
将JPG转为BMP,JPG名为JPGFileName,BMP名为BmpFileNamefunction Bmp2JPG(BmpFileName,JPGFileName:string;CompressRate:integer=86):boolean;
var jpg:TJPEGImage;
    bmp:tBitMap;
begin
  jpg:=TJPEGImage.create;
  bmp:=TBitMap.create;
  result:=true;
  try
    bmp.LoadFromFile(BmpFileName);
    jpg.assign(bmp);
    jpg.CompressionQuality:=CompressRate;
    jpg.SaveToFile(JPGFileName);
  except
    result:=false;
  end;
  jpg.free;
  bmp.free;
end;
function JPG2BMP(JPGFileName,BmpFileName:string):boolean;
var jpg:TJPEGImage;
    bmp:tBitMap;
begin
  jpg:=TJPEGImage.create;
  bmp:=TBitMap.create;
  result:=true;
  try
    jpg.loadfromfile(JPGFileName);
    bmp.assign(jpg);
    bmp.SaveToFile(BmpFileName);
  except
    result:=false;
  end;
  jpg.free;
  bmp.free;
end;

Answer 3

能给我个具体的例如将一个JPG格式的图象旋转的例子吗