Comments on: Giving your users changeable or custom headers in themes

By: Tony Stark

Tony Stark — Fri, 29 Jan 2010 00:19:57 +0000

Thanks for the reply.

I looked into wp-admin/custom-header.php and it looks like it’s happening on the crop. So I tested uploading a png with the correct size and sure enough it maintains its png/transparency.

I can’t figure out what to edit in custom-header.php though.

I do see under function step_3 is:

‘post_mime_type’ => ‘image/jpeg’,

which i tried editing to say “$type” or “image/png” or “png”, but nothing changes it still converts to a .jpeg, even when elimanate that string entirely. Somewhere is a function that converts but I can’t read the php code that gives it away.

At least I can make a tutorial or a notes page to instruct people to crop it to the default size prior to the upload.

By: andrea

andrea — Thu, 28 Jan 2010 23:03:42 +0000

The custom header API that you’re hooking into with this code is in the core. So that conversion is core, not in the code above.

By: Tony Stark

Tony Stark — Thu, 28 Jan 2010 22:56:33 +0000

Question:

Can this be edited so that when a user uploads a png with transparency it will maintain a png and thus its transparency?

Right now, it automatically converts to jpeg and turns the background black.

By: andrea

andrea — Thu, 28 Jan 2010 21:28:59 +0000

It’s not meant to be a cookie cutter hack. I think the post states that the *example code* still needs to be edited for your particular theme. It;s meant as a means to understand the process, so you’re not just copy/pasting code in will-nilly with no idea what it’s supposed to do.

I don’t envy your theme list. Sure they haven’t been done already?

By: Tony Stark

Tony Stark — Thu, 28 Jan 2010 21:17:06 +0000

fyi, this is NOT a cookie cutter hack.

I’ve used this one 5 or themes and just starting to get over the learning curve. I still got 50 or so more themes to do.

So far, every theme has required significant edits in the style.css and header.php files, as well as editing the example function.php file.

Why the example in the post is different than the actual one used is beyond me.

More tips are listed here.

http://mu.wordpress.org/forums/topic/13723

Thanks for getting me on the right track.

By: tmo

tmo — Wed, 27 Jan 2010 22:11:47 +0000

Sorry to bug you.. I had the same image from other custom header theme then uploaded same image again and it threw error with both images…same name. cleared both tried again, smooth sailing! thanks

By: Thomas

Thomas — Tue, 26 Jan 2010 23:17:21 +0000

Hi Andrea- Did this once on a theme and it worked first try. No tried on another and it works on front end but in admin area i get this:

Warning: Cannot modify header information – headers already sent by (output started at /home/content/71/4743871/html/wp-content/themes/tstore/functions.php:45) in /home/content/71/4743871/html/wp-includes/functions.php on line 792

can you help? thanks!

By: dandam

dandam — Tue, 26 Jan 2010 22:27:08 +0000

Many thanks!

Would be great to link to this from http://codex.wordpress.org/Appearance_Header_Image_and_Color_SubPanel

With your permission, I’ll share the code there by way of a more detailed entry.

Again, many many thanks!

By: sid

sid — Thu, 07 Jan 2010 16:59:37 +0000

Thanks so much Andrea, It worked after a copied the code from your sample functions.php

By: andrea

andrea — Mon, 14 Dec 2009 22:02:50 +0000

“and drop the header image in my theme folder,”

The code above adds a menu to the backend of WP. the header gets uploaded there, it doesn’t go in the theme folder.

Anything done in that menu is only specific for that blog.