那位delphi高手可以告所我。處理完位圖后，如何才能修改分辨率或尺寸（厘米或英寸），然后保存呢？ 先谢谢……

BMP.Width BMP.Height 改變圖的大小後用 用 StretchBlt

{这个是photoshop的修改图片大小的界面} 首先谢谢您 wameng！ { BMP.Width BMP.Height 改變圖的大小後用 用 StretchBlt } 圖像素值被改变了啊~~，可不可以不改像素值只修改分辨率呢？当然，改后的圖象尺寸是改变了的（厘米或英寸）。 {我是想可不可以象上面那样修改，比如保持像素不变，只改变分辨率}

SetBitmapDimensionEx The SetBitmapDimensionEx function assigns preferred dimensions to a bitmap. These dimensions can be used by applications; however, they are not used by the system. BOOL SetBitmapDimensionEx( HBITMAP hBitmap, // handle to bitmap int nWidth, // bitmap width in .01-mm units int nHeight, // bitmap height in .01-mm units LPSIZE lpSize // original dimensions ); Parameters hBitmap [in] Handle to the bitmap. The bitmap cannot be a DIB-section bitmap. nWidth [in] Specifies the width, in 0.1-millimeter units, of the bitmap. nHeight [in] Specifies the height, in 0.1-millimeter units, of the bitmap. lpSize [out] Pointer to a SIZE structure to receive the previous dimensions of the bitmap. This pointer can be NULL. Return Values If the function succeeds, the return value is nonzero. If the function fails, the return value is zero. Windows NT/2000/XP: To get extended error information, call GetLastError. Remarks An application can retrieve the dimensions assigned to a bitmap with the SetBitmapDimensionEx function by calling the GetBitmapDimensionEx function. The bitmap identified by hBitmap cannot be a DIB section, which is a bitmap created by the CreateDIBSection function. If the bitmap is a DIB section, the SetBitmapDimensionEx function fails. Requirements Windows NT/2000/XP: Included in Windows NT 3.1 and later. Windows 95/98/Me: Included in Windows 95 and later. Header: Declared in Wingdi.h; include Windows.h. Library: Use Gdi32.lib.

能否直接修改位圖文件头信息来修改分辨率（圖象尺寸）呢？

SetBitmapDimensionEx(B.Handle,1000,1000*P,nil); 試試看！ 我對這個API 不是很熟悉！