General Support: Watermarking with phpThumb

I'm not really into PHP, but doesn't the if-statement say "if type is NOT small"? Then the filter would only be applied when the picture is not small. Would make sense. Who wants a watermark on a small thumb?

But this is probably a stupid answer... :)

On line 18, generate_thumb() has this signature:
function generate_thumb($path, $prefix, $type = 'small')

Is that assignment doing something bizarre? I've never seen that syntax, but until I wondered if it was causing problems. You're clearly a much better php programmer than I, but wondered if that wasn't the cause of the problem.

Thanks for the fixes, I will try to implement them shortly.

Regards,
Derek

Sure, Jack. It's hosted temporarily on my own server, but it's a project done for a photographer friend of mine, and my first experience with Plogger. I won't post it into the examples thread yet, until it's finished, but here is a temporary URL in the interim. You'll notice the links to information I don't have (like his Bio and such) don't work, because I need to get them from him, but the galleries et al should work fine. Also keep in mind many of the photos will not make the actual website, but were needed for testing, etc.

He's admittedly computer-unfriendly, so he didn't want a CMS or blogging platform; he wanted something he could upload pictures to, organize them, and be done with it. I wanted a gallery that was easily-customizable, powerful, XHTML & CSS friendly, but still offered him that simplicity. It's a tall order.

I can't decide how big to make the large thumbs, because he wants good images but doesn't want them breaking the viewport, which is understandable.

Notice the CSS isn't quite finished, so there are some cramped spaces which need fixing, and I'm not sure where the thumbnail navigation (via Plugger) will end up. Looks better in Firefox than anything else, but the CSS should be almost spot-on with any CSS1 compatible browser. Still have to get it sitechecked (eventually) in CSS-Discuss.

http://www.automatamedia.com/royer

The watermark is a PNG-24 Alpha transparent image, saved to /images/watermark.png. Then, on line 85 of plog-functions.php, I inserted (thanks to Mike for the workaround):

if ($thumb_config['filename_prefix'] != '') { // add only for large thumbs
$phpThumb->fltr = array("wmi|images/watermark.png|BR|50|5";); }
// watermark-image, filename, corner (bottom-right), 50% opacity, 5% edge margin

phpThumb then parses the string with the pipes ("|") to get the filter settings. For info about that, check out your Plogger install in /lib/phpthumb/docs, or check out phpthumb.sourceforge.net.

Regards,
Derek

That will be because I wiped all of the thumb cache for watermark testing, so right now it has to generate each one fresh. As people make it through all of the galleries (I would make an initial run on the live site), the thumbs will be generated and cached and make load times a lot better.

Thanks for the comments,
Derek

I was just looking how to add a similar system.

I used the derek's script, wich works fine in local. But it seems to have some problems on my server. I empty the thumbs cache directory, but all thumbs are re-created without the watermark :/

I'll try to sort it out now

The watermarking is for both branding and protection, though I agree it won't work in all circumstances, it's harder for somebody to remove then take credit for it. The images aren't small enough they can be used in print, etc, so I'm not too worried about it. Secondly, if the images do make their way around, one should be able to find the website by googling his name (yes I considered adding the URL, but it makes the watermark look sloppy and way too long).

And yes, I made a new function generate_album_menu that returns an unordered list of all galleries and are linked to the menu (much like the Jump Menu). That way, when he adds albums (with pictures), they will appear in the menu.

Derek

Floo: Make sure you upload the watermark to the server, too.

Well, there is an option in phpThumb to tile the watermark. I might do that instead, but very lightly. Then again, it's hard to do without ruining the image; if people are really intent on taking the image, there isn't a whole lot you can do. Even digital watermarking isn't sufficient.

Btw, once you include gallery.php, you can call any function anywhere on the page.

And sure, I will post the function shortly.

Regards,
Derek

Check out the phpThumb page, should give you a good start. Just call the images through phpThumb and force the watermark.
http://phpthumb.sourceforge.net/demo/demo/phpThumb.demo.demo.php

puk, you can use Derek's code above. Just add,

if ($thumb_config['filename_prefix'] != '') { // add only for large thumbs
$phpThumb->fltr = array("wmi|images/watermark.png|BR|50|5";); }

to plog-functions: generate_thumbnail()

Change that string "wmi|images/watermark.png|BR|50|5" to suit your needs. The format of the string is based on these rules:

"wmi" (WaterMarkImage)
[ex: &fltr[]=wmi|<f>|<a>|<o>|<m>] where
<f> is the filename of the image to overlay;
<a> is the alignment (one of BR, BL, TR, TL, C,
R, L, T, B, *) where B=bottom, T=top, L=left,
R=right, C=centre, *=tile);
<o> is opacity from 0 (transparent) to 100 (opaque)
(requires PHP v4.3.2, otherwise 100% opaque);
<m> is the edge (and inter-tile) margin in percent
- "wmt" (WaterMarkText)
[ex: &fltr[]=wmt|<t>|<s>|<a>|<c>|<f>|<o>|<m>|<n>]
where:
<t> is the text to use as a watermark;
<s> is the font size (1-5 for built-in font, or point
size for TrueType fonts);
<a> is the alignment (one of BR, BL, TR, TL, C, R, L,
T, B, * where B=bottom, T=top, L=left, R=right,
C=centre, *=tile);
<c> is the hex color of the text;
<f> is the filename of the TTF file (optional, if
omitted a built-in font will be used);
<o> is opacity from 0 (transparent) to 100 (opaque)
(requires PHP v4.3.2, otherwise 100% opaque);
<m> is the edge (and inter-tile) margin in percent;
<n> is the angle

Your exactly right, that is what it is supposed to do.

Now that you mention it, maybe it isn't working at all. I will have to look into it.

I think this is unnecessary, there is no reason why the code we have shouldn't work. You can see here, PHP is designed to use default parameters (as seen above) to avoid declaring multiple function prototypes (as seen in your example), there must be something else going on.

Example: http://www.hudzilla.org/phpbook/read.php/4_15_5