How to create post thumbnail

Question

I am working on the WordPress Twenty Ten theme, and I want to display post thumbnails. I have followed the steps below:

• Added following code in functions.php file:

  if ( function_exists( 'add_theme_support' ) ) { 
      add_theme_support( 'post-thumbnails' ); 
  }
  

• I have also defined post thumbnail size,

  set_post_thumbnail_size( 150, 150 );
  

• And I configured the media settings from the admin panel of WordPress to not to crop image. but this is cropping the image.

• Using this in loop.php file,

  the_post_thumbnail(array(150,150);
  

I do not want to crop the image. How can I do this? Please help where I am wrong in my process.

Thanks in advance.

Answer 1

IF you want to retrieve thumbnail in size that you had set with set_post_thumbnail_size() then call the_post_thumbnail() without passing any arguments.

That will default to named post-thumbnail size that that set_post_thumbnail_size() actually creates.

Also crop for this will be determined by third argument in set_post_thumbnail_size() (defaults to false) and is not tied to media settings (those control entirely different sizes of image).

Answer 2

Maybe it's just a typo, use

the_post_thumbnail(array(150,150));

instead of

the_post_thumbnail(array(150,150);

Another thing is, I've never used this in the loop.php only in functions.php

Answer 3

A couple things to try:

1. Create a new custom image size: add_image_size( 'my-custom-thumb', 150, 150 ); Play around with the dimensions, to see how WordPress reacts. There may be a collision, since there is already a 150x150 image size.

2. Regenerate your thumbnails, using the Regenerate Thumbnails Plugin or the Ajax Thumbnail Rebuild Plugin.

3. And, as @Rarst said: remove the array from the call to the_post_thumbnail(); either pass it no parameters, or pass it an image-size-name as an argument.