I create a transparent gif with text with the gd library but the output quality of the Text isn't good. Has anybody an idea how can I improve the quality?
Here is the code:
$req = explode('|', $_REQUEST['r']);
$text = $req[0];
header ("Content-type: image/gif");
$font = getFont($req[2]);
$font_size = $req[1];
$tmpcolor = getColor($req[3]);
$tmp_image=#imagecreatefromgif('gfx/transparent.gif');
$width = imagesx($tmp_image);
$height = imagesy($tmp_image);
//calculate the new width / height
$tmp = imagettfbbox($font_size,0,$font,$text);
$new_width = $tmp[2]+10;
$new_height = $font_size+5;
$new_image = imagecreate($new_width,$new_height);
ImageCopyResized($new_image, $tmp_image,0,0,0,0, $new_width, $new_height, $width, $height);
$black = ImageColorAllocate($new_image, 0, 0,0);
$trans = ImageColortransparent($new_image,$black);
$color = ImageColorAllocate($new_image, trim($tmpcolor[0]), trim($tmpcolor[1]), trim($tmpcolor[2]));
imagettftext($new_image, $font_size, 0, 0, $font_size, $color, $font, $text);
//Grab new image
imagegif($new_image);
imagedestroy($new_image);
imagedestroy($tmp_image);
Here is the result:
http://desmond.yfrog.com/Himg691/scaled.php?tn=0&server=691&filename=createphp.gif&xsize=640&ysize=640
Thank you
GIF format supports only 1-bit transparency (so pixel is either transpatent or opaque), so your text has jagged edges. To get smooth edges, use PNG format (which has 8-bit alpha channel, which means 256 levels of translucency), use GIF without transparency (i.e. on opaque background).
Other answerers point out that this could be a simple transparency issue rather than a TrueType rendering one. Try those suggestions first, as they may already remedy the problem at hand.
Sadly, GD's TrueType font rendering capabilities are not great.
Try the imageFTText() family of functions first. They rely on the external FreeType library which is better in quality, and also respects the kerning information in TrueType fonts (the individual distances between specific pairs of characters that make text look regular) better than the TTF functions.
If that doesn't work, use Imagemagick which in my experience is far superior to anything GD has to offer.
Try using imagecreatetruecolor instead of imagecreate.
Related
I am trying to create an image from an another image using PHP. Here is my code:
<?php
$width = 109;
$height = 109;
$image = imagecreatetruecolor($width, $height);
$source_under = imagecreatefrompng('ecloid_under.png');
$black = imagecolorallocate($image, 0x00, 0x00, 0x00);
imagecolortransparent($image, $black);
imagecopy($image, $source_under, 0, 0, 0, 0, $width, $height);
header('Content-type: image/png');
imagepng($image);
imagedestroy($image);
?>
So I am loading this image in $source_under
and copying it over a transparent blank "canvas" image. Here is the result of that operation:
As can be seen, there is a sort of black border around the whole initial image. I think this is due to the fact that initially, the "canvas" image is all black. So there is something wrong with the transparency and the anti-aliasing of the image.
This isn't the first time I have a similar problem, but last time the source image was the cause. This time around, opening it in Photoshop does not show any potential problems with it.
Does anyone know how to fix this?
Can you try to enable alpha blending on $image before you copy the original to it:
imagealphablending($image, true);
Second try would be to create a transparent color and to fill $image with that color before the copy.
$transparent = imagecolorallocatealpha($image, 0, 0, 0, 127);
imagefill($image, 0, 0, $transparent);
imagealphablending($image, true);
You have partial transparency around the edges of your source image. That makes it combine with the black of the canvas image (which you normally can't see because it's 100% transparent), giving the results you see. You could avoid this by making sure your entire alpha channel on the source image is either 100% or 0%, or by choosing a more appropriate base color for your canvas image (i.e. one that matches the background color scheme of your site).
Fabio Anselmo's comment would help in that GIFs don't have a real alpha channel -- GIF transparency is all-or-nothing -- so saving as one will accomplish the 100%-or-0% solution. Unless you're extremely careful it will also give you a "border" right there in the source image -- made up of whatever background color you have or select in the GIF conversion -- as a result of your image's antialiasing. (However, the interlacing part is irrelevant.)
I am using this code to creating images with text written in it with transparent backgrounds.
<?php
// Set the content-type
header('Content-Type: image/gif');
// Create the image
$im = imagecreatetruecolor(400, 150);
// Create some colors
$black = imagecolorallocate($im, 0, 0, 0);
$acolor = imagecolorallocate($im, 153, 204, 153);
imagecolortransparent($im, $black);
// The text to draw
$text = 'Testing...';
// Replace path by your own font path
$font = 'arial.ttf';
// Add the text
imagettftext($im, 50, 0, 10, 100, $acolor, $font, $text);
// Using imagegif()
imagegif($im,"img.gif");
imagedestroy($im);
?>
But text which is written in img.gif has some unwanted color(Black) on borders of alphabets('e,s,n,g'). How can i finish that color.The generated image is
The arial font download site is http://code.google.com/p/ireader/downloads/detail?name=arial.ttf
The GIF format cannot handle alpha transparency. It can have only 100% transparent (= invisible), or 100% opaque (= visible) pixels.
Your text seems to have anti-aliased, soft edges.
Those edges aren't 100% transparent, but they're also not 100% opaque - they are a mixture of foreground and background. That makes them appear softer.
Because the GIF format can't deal with these nuances, the library uses a mixture of green and black to simulate a "weaker" green.
If you use the PNG format, the problem should go away: PNG supports alpha transparency. There are some issues that you need to look into if you still need to support IE6, but for every other browser, this will work fine straight away.
Hay, I want to use PHP's GD library to open a GIF image and increase the canvas's height by 100 pixels, then fill the new space with the hex colour #EEEEEE.
Does anyone have any idea how i would do this?
Get the original size with getimagesize
Use imagecreate to create your "new" image with the desired size
Fill the new image with #eeeeee using imagecolorallocate (see note)
Use imagecopy to copy your original image into the new one
If your question is "Does anyone have any idea how i would do this?" Then the answer is yes. Most probably someone have an idea how you could do it. :)
Otherwise this should do the trick:
$image = imagecreatefromgif('file.gif');
list($imageWidth, $imageHeight) = getimagesize('file.gif');
$newimage=imagecreatetruecolor($imageWidth, $imageHeight+100);
$gray=imagecolorallocate($newimage, 0xEE, 0xEE, 0xEE);
imagefill($newimage,0,0,$gray);
imagecopy($newimage, $image, 0, 0, 0, 0, imageWidth, $imageHeight);
imagegif($newimage,'newimage.gif');
i want to combine text and image on the fly to create a jpg widget. I want to do this for a fundraising website, i will need to update the image once a day so it reflect the updated fundraising progress bar. The reason why i want a jpg (image) widget is because it is much more friendly to add to blogs, website etc.
you can do it with gd
//open up the image you want to put text over
$im = imagecreatefromjpeg($imagePath);
//The numbers are the RGB values of the color you want to use
$black = ImageColorAllocate($im, 255, 255, 255);
//The canvas's (0,0) position is the upper left corner
//So this is how far down and to the right the text should start
$start_x = 10;
$start_y = 20;
//This writes your text on the image in 12 point using verdana.ttf
//For the type of effects you quoted, you'll want to use a truetype font
//And not one of GD's built in fonts. Just upload the ttf file from your
//c: windows fonts directory to your web server to use it.
Imagettftext($im, 12, 0, $start_x, $start_y, $black, 'verdana.ttf', 'text to write');
//Creates the jpeg image and sends it to the browser
//100 is the jpeg quality percentage
Imagejpeg($im, '', 100);
ImageDestroy($im);
I'd suggest you look into Imagemagick.
http://php.net/manual/en/book.imagick.php
I have a watermark script I am working on, the results are good on PNG and on JPG images however a gif image, not so good. I am using PHP and GD
Below you can see the difference in quality of the watermark.
Anyone know how to improve this?
For the gif version I am using
$image = imagecreatefromgif($source_file);
imagecopymerge($image, $watermark, $x, $y, 0, 0, $water_width, $water_height, 65);
imagegif($image, $source_file);
gif image = bad quality
gif image http://img2.pict.com/fd/46/00/1471179/0/gif.gif
jpg image = good
jpg image http://img2.pict.com/82/a1/5a/1471181/0/jpg.jpg
GIF images have a fixed palette that can contain a maximum of 256 colors. The issue here is probably that the image your inserting uses colors that isn't available in the target image.
I have never tried this, but it might be worth a shot. You could try converting the gif image to a true color image first, then do the watermarking and after that converting it back to gif.
$image = imagecreatefromgif($source_file);
// create a true color image of the same size
$image2 = imagecreatetruecolor(imagesx($image), imagesy($image));
// copy the original gif image on to the true color image
imagecopy($image2, $image, 0, 0, 0, 0, imagesx($image), imagesy($image));
// copy the watermark onto the new true color image
imagecopymerge($image2, $watermark, $x, $y, 0, 0, $water_width, $water_height, 65);
// write the new image to disk
imagegif($image2, $source_file);
Try it and see if it makes a difference.
There's also a couple of palette manipulation functions available that might help:
imagecolormatch()
imagetruecolortopalette()
imagepalettecopy()
I'm not sure how you would apply them, but I'm guessing that there's a few things you could do to improve the results.
GIF only supports a color palette of 256 colors. Therefore, the colors of your watermark image have to be mapped to this palette. This caused them to be rendered and saved with different colors than before. Due to this small palette, GIF is not recommended for photos in general, anyways.
GIF images will never look great, as the colour palette is 256 colours. As MrMage says, colour mapping causes a severe approximation of the true colours of the image. You are better off with PNGs, they do support transparency.