将图片变成字符的小工具

{
图片 到 ascii图片的转换
convert picture to ascii text picture
support format: png, jpg(jpeg), bmp
}
program pic2ascii;
{$mode objfpc}
uses
FPReadPNG, FPReadBMP, fpreadjpeg,
{$ifndef UseFile}classes,{$endif}
FPImage, sysutils;
const
ascii_chars : string = '$@B%8&WM#*oahkbdpqwmZO0QLCJUYXzcvunxrjft/\|()1{}[]?-_+~<>i!lI;:,"^`''. '; //用来替代像素的字符集合
//txtSize : integer = 100; //生在 ascii 图像的最大边的高度（未实现), output txt file max(width,height) unfinished
{全局变量, global vars}
var
img : TFPMemoryImage;
picFile, txtFile : string;
{初始化init}
procedure init();
begin
if paramcount = 1 then
begin
picFile := paramstr(1);
txtFile := 'pic2ascii.txt';
img := TFPMemoryImage.Create(0,0);
end
else if paramcount = 2 then
begin
picFile := paramstr(1);
txtFile := paramstr(2);
img := TFPMemoryImage.Create(0,0);
end
else
begin
writeln('example: pic2ascii hello.jpg');
writeln('example: pic2ascii hello.jpg hello.txt');
Halt(1);
end;
end;
{endswith}
function EndsWith(const src: String;const Substr :String):Boolean;
var
I,I2: Integer;
begin
Result := true;
I2 := Length(SubStr);
i:=length(src);
if i<i2 then exit (false);
for I := 1 to i2 do begin
if not(src[length(src)-i2+i] = Substr[i]) then begin
Result := false;
exit;
end;
end;
end;
{ReadImage}
procedure ReadImage;
{$ifndef UseFile}var str : TStream;{$endif}
t:string;
reader : TFPCustomImageReader;
begin
T := upcase (picFile);
reader:=nil;
if endsWith(t,'.BMP') then
Reader := TFPReaderBMP.Create
else if endswith(t,'.JPEG') or endswith(t,'.JPG') then
Reader := TFPReaderJPEG.Create
else if endswith(t,'.PNG') then
Reader := TFPReaderPNG.Create
else
begin
Writeln('Unknown file format : ',T);
Halt(1);
end;
if assigned (reader) then
begin img.LoadFromFile (picFile, Reader); Reader.Free; end
else
{$ifdef UseFile}
img.LoadFromFile (picFile);
{$else}
if fileexists (picFile) then
begin
str := TFileStream.create (picFile,fmOpenRead);
try
img.loadFromStream (str);
finally
str.Free;
end;
end
else
begin
writeln ('File ',picFile,' doesn''t exists!');
Halt(1);
end;
{$endif}
end;
{get_chars}
function get_chars(color : TFPColor):char;
var
l:integer;
gray : longint;
u : double;
r,g,b,alpha:integer;
begin
alpha := (color.alpha and $ff00) shr 8;
r := (color.red and $ff00) shr 8;
g := (color.Green and $ff00) shr 8;
b := (color.Blue and $ff00)shr 8;
if alpha = 0 then exit(' ');
l := length(ascii_chars);
gray := trunc( 0.2126 * r + 0.7152 * g + 0.0722 * b );
u := alpha / l ;//将256个像素均分给字符
if trunc(gray/u) < l then
exit ( ascii_chars[ trunc( gray / u ) + 1 ])
else
exit (' ');
end;
{ConvertImage}
procedure ConvertImage;
var
outputHeight, outputWidth, h, w, x, y:integer;
f : text;
begin
h := img.Height;
w := img.Width;
outputHeight:=h;
outPutWidth:=w;
{
//To Do: 按比例缩放图像
// To Do : resize picture here (unfinished)
}
assign(f,txtFile);
rewrite(f);
for y:= 1 to outputHeight do
begin
for x:=1 to outPutWidth do
write(f,get_chars(img.colors[x-1,y-1]));
writeln(f);
end;
close(f);
end;
{clean}
procedure Clean;
begin
Img.Free;
end;
{main}
begin
try
//writeln ('Initing');
Init;
//writeln ('Reading image');
ReadImage;
// writeln ('Convert image');
ConvertImage;
//writeln ('Clean up');
Clean;
except
on e : exception do
writeln ('Error: ',e.message);
end;
end.

你选用的字符的依据是什么？

感觉这个程序很好玩，可以给我邮箱发一份源码吗？百度云盘我这里访问不了。

LZ666,话说我玩儿过LZ的俄罗斯方块

傻眼了