我們知道在一般的bmp檔，我們可以用 tempPtr=(Byte*)Image1->Picture->Bitmap->ScanLine[y]; 然後，用tempPtr[x*3]、tempPtr[x*3 1]、tempPtr[x*3 2]的方式讀到一個pixel的值 請問一下，PGM檔也是用此方式嗎？ 這樣讀到的值似乎怪怪的 不知道有沒有人試過讀取PGM檔的pixel值 謝謝

我從網路上抓下來的PGM檔案格式... 給你參考... 基本上你可能要用讀file的方法..把PGM讀進來... 接著再將PGM裡面有關影像的資料..一個一個填入Image中...    若有問題...再來討論唄..^^    ==========================================================

NAME
     pgm - portable graymap file format    DESCRIPTION
     The portable graymap format is a lowest  common  denominator
     grayscale file format.  The definition is as follows:         - A "magic number" for identifying the  file  type.   A  pgm
       file's magic number is the two characters "P2".         - Whitespace (blanks, TABs, CRs, LFs).         - A width, formatted as ASCII characters in decimal.         - Whitespace.         - A height, again in ASCII decimal.         - Whitespace.         - The maximum gray value, again in ASCII decimal.         - Whitespace.         - Width * height gray values, each in ASCII decimal, between
       0  and  the  specified  maximum  value,  separated by whi-
       tespace, starting at the top-left corner of  the  graymap,
       proceeding  in normal English reading order.  A value of 0
       means black, and the maximum value means white.         - Characters from a "#" to the next end-of-line are  ignored
       (comments).         - No line should be longer than 70 characters.         Here is an example of a small graymap in this format:
     P2
     # feep.pgm
     24 7
     15
     0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0
     0  3  3  3  3  0  0  7  7  7  7  0  0 11 11 11 11  0  0 15 15 15 15  0
     0  3  0  0  0  0  0  7  0  0  0  0  0 11  0  0  0  0  0 15  0  0 15  0
     0  3  3  3  0  0  0  7  7  7  0  0  0 11 11 11  0  0  0 15 15 15 15  0
     0  3  0  0  0  0  0  7  0  0  0  0  0 11  0  0  0  0  0 15  0  0  0  0
     0  3  0  0  0  0  0  7  7  7  7  0  0 11 11 11 11  0  0 15  0  0  0  0
     0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0  0    AUTHOR
     Copyright (C) 1989, 1991 by Jef Poskanzer.

============================================================== =========== 有興趣,就能進步 ===========

嗯嗯，謝謝 我原本是想用ScanLine的方式讀值 因為，我怕用Image->Canvas->Pixels[x][y]的方式會很慢 但我實作的結果還可以接受 不知道有沒有測過這二種方法的效率差多少

引言: 嗯嗯，謝謝 我原本是想用ScanLine的方式讀值 因為，我怕用Image->Canvas->Pixels[x][y]的方式會很慢 但我實作的結果還可以接受 不知道有沒有測過這二種方法的效率差多少

cowbjt你好: 如果只做幾個點,相差不多, 但如果做一整張圖, 則差很多。

請問用Image->Canvas->Pixels[x][y]的方法讀PGM，讀到的值還是TColor嗎？