我在學校修一門叫數位影像處理的課 老師要求我們寫程式實作 其中我發現到,每個piexl值我用byte值存跟用integer值存,其結果是不同的 我知道byte是用8bit來表示 integer是用32ibt來表示 可是怎麼同樣的資料量,為什麼用8bit表示是正常, 用成32表來表示就錯了呢? 例如: temp := Image1.Canvas.Pixels[1,1]; //其中temp是byte型態 ShowMessage('temp is ' IntToStr(temp)); //顯示 temp is 160 i := Image1.Canvas.Pixels[1,1]; //其中 i 是integer型態 ShowMessage('i is ' IntToStr(i)); //顯示 i is 10526880 很明顯地用 i 來存是錯的,可是這是為什麼呢? 我同學用的是BCB,他們用int來存pixel值,就是很正常的咧? 另外,有沒有什麼方法能把pixel值也存成integer型態呀? 懇請各位前輩給小弟一點指教,謝謝~

CPTL 您好: 請參考 Delphi Online Help 查 key word : TColor Image1.Canvas.Pixels[1,1]; 傳回的是 TColor Type 節錄 Online Help : If you specify TColor as a specific 4-byte hexadecimal number instead of using the constants defined in the Graphics unit, the low three bytes represent RGB color intensities for blue, green, and red, respectively. The value $00FF0000 (Delphi) or 0x00FF0000 (C ) represents full-intensity, pure blue, $0000FF00 (Delphi) or 0x0000FF00 (C ) is pure green, and $000000FF (Delphi) or 0x000000FF (C ) is pure red. $00000000 (Delphi) or 0x00000000 (C ) is black and $00FFFFFF (Delphi) or 0x00FFFFFF (C ) is white. If the highest-order byte is zero, the color obtained is the closest matching color in the system palette. If the highest-order byte is one ($01 or 0x01), the color obtained is the closest matching color in the currently realized palette. If the highest-order byte is two ($02 or 0x02), the value is matched with the nearest color in the logical palette of the current device context. 所以您利用 integer 或 TColor 接回來的值是 RGB ,再仔細分析傳回值... 160 = A0 , 10526880 = A0A0A0 ... 所以利用 byte 傳回的值,是 RGB 值被截斷的結果... ---- 我只會兩件事,這也不會,那也不會 眼見不一定為真 ----