你可以找到：system\config\image.php 这里面有配置头像，话题，问题和文章上传图片的配置。 其中 min square 是调用对应的裁剪的后图片，而非原图，在开发图片调用过程中尽量少调用原图，网页加载也快，图片也不会变形，节约宽带。 注意，运营的网站不宜配置，新站可以。

  <?php

$config['avatar_thumbnail'] = array(
	'min' => array(
		"w" => 32,
		"h" => 32
	),
	'mid' => array(
		"w" => 50,
		"h" => 50
	),
	'max' => array(
		"w" => 100,
		"h" => 100
	)
);

$config['topic_thumbnail'] = array(
	'min' => array(
		"w" => 32,
		"h" => 32
	),
	'mid' => array(
		"w" => 50,
		"h" => 50
	),
	'max' => array(
		"w" => 100,
		"h" => 100
	)
);

$config['attachment_thumbnail'] = array(
	'min' => array(
		"w" => 210,
		"h" => 130
	),
	'square' => array(
		"w" => 100,
		"h" => 100
	)
);

$config['feature_thumbnail'] = array(
	'min' => array(
		"w" => 32,
		"h" => 32
	),
	'mid' => array(
		"w" => 540,
		"h" => 240
	),
	'max' => array(
		"w" => 990,
		"h" => 240
	)
);

$config['chapter_thumbnail'] = array(
	'min' => array(
		"w" => 32,
		"h" => 32
	),
	'max' => array(
		"w" => 50,
		"h" => 50
	)
);