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Hello! This class is great! Do you have class like this but doing convertion from gif to bmp (without using additional libraries)?

Hi

I’ve been asked to generate a graph in Excel the only way I could see to do this was to use the GD libary to create an image and then import this into Excel.

This was then made more complicated because I can only import a BMP into Excel, which is when I found your class. Which is great by the way. Unfortunately something doesn’t quite work as the image is created but it will not import.

If I open the image in paint and then import it into Excel it work’s.

Any Idea’s??

How I cah check that bmp have 24bit?

Hello,

2Terry: I’m also use this class for pre-saving image in bmp format to insert it in Excel file.

For me it works with :
$size= 54+4*ceil($wid*24/32.0)*$hei;
Old is :
//$size = 54 + ($wid + $wid_pad) * $hei * 4; //fixed

Hi,

I updated the function ‘ImageCreateFromBMP’

Found here: http://php.net/manual/en/function.imagecreate.php

and renamed to ‘imagecreatefrombmp’ and now it works with all BMPs not just 24 bit

/*********************************************/
/* Fonction: ImageCreateFromBMP */
/* Author: DHKold */
/* Contact: admin@dhkold.com */
/* Date: The 15th of June 2005 */
/* Version: 2.0B */
/*********************************************/
function imagecreatefrombmp($filename)
{
//Ouverture du fichier en mode binaire
if (! $f1 = fopen($filename,”rb”)) return FALSE;

//1 : Chargement des ent�tes FICHIER
$FILE = unpack(“vfile_type/Vfile_size/Vreserved/Vbitmap_offset”, fread($f1,14));
if ($FILE['file_type'] != 19778) return FALSE;

//2 : Chargement des ent�tes BMP
$BMP = unpack(‘Vheader_size/Vwidth/Vheight/vplanes/vbits_per_pixel’.
‘/Vcompression/Vsize_bitmap/Vhoriz_resolution’.
‘/Vvert_resolution/Vcolors_used/Vcolors_important’, fread($f1,40));
$BMP['colors'] = pow(2,$BMP['bits_per_pixel']);
if ($BMP['size_bitmap'] == 0) $BMP['size_bitmap'] = $FILE['file_size'] – $FILE['bitmap_offset'];
$BMP['bytes_per_pixel'] = $BMP['bits_per_pixel']/8;
$BMP['bytes_per_pixel2'] = ceil($BMP['bytes_per_pixel']);
$BMP['decal'] = ($BMP['width']*$BMP['bytes_per_pixel']/4);
$BMP['decal'] -= floor($BMP['width']*$BMP['bytes_per_pixel']/4);
$BMP['decal'] = 4-(4*$BMP['decal']);
if ($BMP['decal'] == 4) $BMP['decal'] = 0;

//3 : Chargement des couleurs de la palette
$PALETTE = array();
if ($BMP['colors'] = 0)
{
$X=0;
while ($X > 4) ; else $COLOR[1] = ($COLOR[1] & 0×0F);
$COLOR[1] = $PALETTE[$COLOR[1]+1];
}
elseif ($BMP['bits_per_pixel'] == 1)
{
$COLOR = unpack(“n”,$VIDE.substr($IMG,floor($P),1));
if (($P*8)%8 == 0) $COLOR[1] = $COLOR[1] >>7;
elseif (($P*8)%8 == 1) $COLOR[1] = ($COLOR[1] & 0×40)>>6;
elseif (($P*8)%8 == 2) $COLOR[1] = ($COLOR[1] & 0×20)>>5;
elseif (($P*8)%8 == 3) $COLOR[1] = ($COLOR[1] & 0×10)>>4;
elseif (($P*8)%8 == 4) $COLOR[1] = ($COLOR[1] & 0×8)>>3;
elseif (($P*8)%8 == 5) $COLOR[1] = ($COLOR[1] & 0×4)>>2;
elseif (($P*8)%8 == 6) $COLOR[1] = ($COLOR[1] & 0×2)>>1;
elseif (($P*8)%8 == 7) $COLOR[1] = ($COLOR[1] & 0×1);
$COLOR[1] = $PALETTE[$COLOR[1]+1];
}
else
return FALSE;
imagesetpixel($res,$X,$Y,$COLOR[1]);
$X++;
$P += $BMP['bytes_per_pixel'];
}
$Y–;
$P+=$BMP['decal'];
}

//Fermeture du fichier
fclose($f1);

return $res;
}

Hi,
This is great code.
I was wondering if i can reduce size of generated image. Its generated at 595KB, which is very big compared to its PNG version which is hardly 50-70KB.
Thanks.

This adds a function to generate 1-bit bmp-images, how they are often used for monochrome lcd displays in devices (I left out the part for files, no harm to add it yourself).

Thanks for the code, it was a great help to figure out how to go on.

Felix

– code –

function imageBWbmp(&$img, $filename = false)
{
$wid = imagesx($img);
$hei = imagesy($img);
$wid_pad = str_pad(”, $wid % 4, “”);

$size = 62 + ($wid + $wid_pad) * $hei * 3 ; //fixed

//prepare & save header
$header['identifier']= ‘BM’;
$header['file_size'] = dword($size);
$header['reserved'] = dword(0);
$header['bitmap_data'] = dword(62);
$header['header_size'] = dword(40);
$header['width'] = dword($wid);
$header['height'] = dword($hei);
$header['planes'] = word(1);
$header['bits_per_pixel'] = word(1);
$header['compression'] = dword(0);
$header['data_size'] = dword(0);
$header['h_resolution'] = dword(0);
$header['v_resolution'] = dword(0);
$header['colors'] = dword(2);
$header['important_colors'] = dword(2);
$header['color1'] = dword(hexdec(“#00ffffff”));
$header['color2'] = dword(hexdec(“#00000000″));

foreach ($header AS $h){
echo $h;
}

//save pixels
$byte = “”;
for ($y=$hei-1; $y>=0; $y–){
for ($x=0; $x<$wid; $x++){
if(imagecolorat($img, $x, $y) == $header['color1']){
$byte .= "1";
}else{
$byte .= "0";
}
if(strlen($byte) == 8){
echo chr(bindec($byte));
$byte = "";
}
}
echo $wid_pad;
}
}