7 string references to 'image_scale'

hook_image_default_styles in drupal-7.x/modules/image/image.api.php: Provide module-based image styles for reuse throughout Drupal.
ImageAdminStylesUnitTest::testDefaultStyle in drupal-7.x/modules/image/image.test: Test to override, edit, then revert a style.
ImageAdminStylesUnitTest::testStyle in drupal-7.x/modules/image/image.test: General test to add a style, add/remove/edit effects to it, then delete it.
ImageDimensionsTestCase::testImageDimensions in drupal-7.x/modules/image/image.test: Test styled image dimensions cumulatively.
ImageStyleFlushTest::testFlush in drupal-7.x/modules/image/image.test: General test to flush a style.
image_image_default_styles in drupal-7.x/modules/image/image.module: Implements hook_image_default_styles().
image_image_effect_info in drupal-7.x/modules/image/image.effects.inc: Implements hook_image_effect_info().