This will allow you to manipulate the thumbnail image ($imgJpeg) using the various gd commands:<?php if (($imgJpeg = exif_thumbnail($strImagePath)) === false) print "No Thumbnail!"; else $imgJpeg = imageCreateFromString($imgJpeg);?>
(PHP 4 >= 4.2.0, PHP 5, PHP 7, PHP 8)
exif_thumbnail — Recupera a miniatura embutida de uma imagem
$file,&$width = null,&$height = null,&$image_type = nullexif_thumbnail() lê a miniatura embutida de uma imagem.
Se for desejado exibir miniaturas através desta função, deve-se enviar a informação do tipo de mídia usando a função header().
É possível que exif_thumbnail() não possa criar uma
imagem mas possa determinar seu tamanho. Neste caso, o valor retornado é
false mas a largura (width) e altura (height)
serão definidos.
fileA localização do arquivo de imagem. Pode ser um caminho ou um fluxo do tipo resource.
widthA largura da miniatura retornada.
heightA altura da miniatura retornada.
image_typeO tipo da imagem da miniatura retornada. Pode ser TIFF ou JPEG.
Retorna a miniatura embutida, ou false se a imagem não contiver
miniatura.
| Versão | Descrição |
|---|---|
| 7.2.0 |
O parâmetro file agora suporta arquivos locais
e recursos de fluxo.
|
Exemplo #1 Exemplo de exif_thumbnail()
<?php
$image = exif_thumbnail('/path/to/image.jpg', $width, $height, $type);
if ($image!==false) {
header('Content-type: ' .image_type_to_mime_type($type));
echo $image;
exit;
} else {
// sem miniatura, gerencia o erro aqui
echo 'Não há miniatura disponível';
}
?>Nota:
Se o parâmetro
filefor usado para passar um fluxo a esta função, ele deve ser do tipo pesquisável. Note que a posição do ponteiro do arquivo não é alterada após o retorno desta função.
This will allow you to manipulate the thumbnail image ($imgJpeg) using the various gd commands:<?php if (($imgJpeg = exif_thumbnail($strImagePath)) === false) print "No Thumbnail!"; else $imgJpeg = imageCreateFromString($imgJpeg);?>If you've edited the image with image editing software and it no longer contains an exif thumbnail, I've created a script that will add one back into it, using the "PHP Exif Library": http://pel.sourceforge.net/index.php<?phprequire_once('../PEL/PelJpeg.php');require_once('../PEL/PelIfd.php');$fullpath = 'images/DSC_0013c.JPG'; # path of source image (does not contain an exif thumbnail) $jpeg = new PelJpeg($fullpath); $exif = $jpeg->getExif(); $tiff = $exif->getTiff(); $ifd0 = $tiff->getIfd(); # need this so that we can later link it to the new IFD $ifd1 = $ifd0->getNextIfd();if (!$ifd1) { # Only create thumbnail if one doesn't exist (i.e. there is no IFD1) $ifd1 = new PelIfd(1); $ifd0->setNextIfd($ifd1); # point ifd0 to the new ifd1 (or else ifd1 will not be read) $original = ImageCreateFromString($jpeg->getBytes()); # create image resource of original $orig_w=imagesx($original); $orig_h=imagesy($original); $wmax = 160; $hmax = 120; if ($orig_w>$wmax || $orig_h>$hmax) { $thumb_w=$wmax; $thumb_h=$hmax; if ($thumb_w/$orig_w*$orig_h>$thumb_h) $thumb_w=round($thumb_h*$orig_w/$orig_h); # maintain aspect ratio else $thumb_h=round($thumb_w*$orig_h/$orig_w); } else { # only set the thumb's size if the original is larger than 'wmax'x'hmax' $thumb_w=$orig_w; $thumb_h=$orig_h; } # create image resource with thumbnail sizing $thumb=imagecreatetruecolor($thumb_w,$thumb_h); ## Resize original and copy to the blank thumb resource imagecopyresampled($thumb,$original, 0,0,0,0,$thumb_w,$thumb_h,$orig_w,$orig_h); # start writing output to buffer ob_start(); # outputs thumb resource contents to buffer ImageJpeg($thumb); # create PelDataWindow from buffer thumb contents (and end output to buffer) $window = new PelDataWindow(ob_get_clean()); if ($window) { $ifd1->setThumbnail($window); # set window data as thumbnail in ifd1 $outpath = $fullpath; # overwrite original jpg file file_put_contents($outpath, $jpeg->getBytes()); # write everything to output filename # Show thumbnail in file: echo '<img src="thumb_exif.php?image='.$outpath.'" border=0 alt="If you see this, it did not work"><br>'; }}else { echo 'ifd1 already exists! (IFD1 is where the thumbnail is stored)<br>';}?><?php # This is the code in thumb_exif.php : $imgdat = exif_thumbnail($_REQUEST['image'], $width, $height, $type); header('Content-type: ' . image_type_to_mime_type($type)); echo($imgdat);?>If you have a lot of such files, you can easily make a script that searches them out and adds thumbnails to their exif.use this if you want to embed a thumbnail directly on the HTML page without writing it first to a file:<?php$image = exif_thumbnail($file, $width, $height, $type);echo "<img width='$width' height='$height' src='data:image/gif;base64,".base64_encode($image)."'>";?>If you want to convert from TIFF to JPG you can use ImageMagick if it is installed in your server.<?php$exec = 'convert /path/to/file.tiff /path/to/file.jpg 2>&1';@exec($exec, $exec_output, $exec_retval);//possible errorprint_r($exec_output)?>Great that the thumbnail can be in TIFF format (f.i. Kodak cameras have embedded thumbnail in TIFF) BUT I have not been able to show TIFF as an embedded image in HTML (using the <IMG...> tag). There seems to be no function in PHP to change TIFF to, lets say, JPG. (imagecreatefromstring gives a 'unknown datatype' error for the TIFF stream. So below sample works great for JPEG embedded thumbnail, but not for TIFF embedded (but then, maybe I did something wrong?):test_exif.php:<HTML><HEAD> <TITLE>Test EXIF Read </TITLE></HEAD><BODY><?php$image='P0000614.JPG';echo("<B>". $image. "</B>:<BR><BR>\n");$exif = exif_read_data($image, 'ANY_TAG',true);if (!$exif===false){ echo("Image contains headers<br><br>"); echo("<A href=showthumb.php?image=" . $image ."> <IMG border=0 src=showthumb.php?image=" . $image ."></A><BR><BR>"); foreach ($exif as $key => $section) { foreach ($section as $name => $val) { echo "$key.$name: $val<br>\n"; } }}else{ echo("Sorry, image <B>".$image . "</B> does not contain (readable) EXIF data.");}?></BODY></HTML>showthumb.php:<?php$imgdat = exif_thumbnail($_REQUEST['image'],$width, $height, $type);header('Content-type: ' . image_type_to_mime_type($type));echo($imgdat);?>When clicking on the <A> opens the TIFF image in the program that windows assigned to this type, but the JPEG opens in the browser.I am using PHP 4.3.6 on windows iis 4 (yeah, I know.....)