The MEDIA SETTINGS sub-panel is where you define options for displaying various media, mainly images, that are available from the MEDIA PANEL in the upper NAVIGATION bar.
WordPress has built-in image reduction. It automatically creates up to three images of different sizes, (thumbnail, medium and large) based on the dimensions in this sub-panel and WordPress also saves the original image, so you can have a total of four image sizes saved for each image you upload.
The exception to this is WordPress will not ENLARGE an image to these sizes, for instance if the original image is the same size as the thumbnail dimension you have entered then this image will not be enlarged to the medium or the large size dimensions.
The default THUMBNAIL size is 150 x 150 pixels, this can be changed to the size you want. The check box below the size will crop the THUMBNAIL to your exact size. Un-checking the box will tell WordPress to re-size the image based on the proportional width and height of the original image.
The Medium Size default is 300 by 300 pixels maximum and the large size can measure up to 1024 by 1024 pixels.
These default dimensions are usually adequate for most images.
To get a better idea of how WordPress re-sizes images I'll download the same image twice - once with the CROP BOX checked and another with the CROP BOX un-checked. I'll also use an image that is smaller that the LARGE SIZE dimension enter so we can see how WordPress handles the re-sizing.
From the MEDIA >> ADD NEW sub-panel I will add an image that is 640 pixels by 480 pixels. This is downloaded with the CROP BOX checked so the thumbnail will be exactly 150 x 150 pixels and since the image is smaller than the 1024 x 1024 pixels for the larger image then WordPress will not have that larger image available.
The first image has a thumbnail size of exactly 150 x 150 pixels since the CROP BOX was checked. It has the medium image available but there is no larger image available since the original size was 640 x 480 and WordPress does not enlarge the images.
While on the second image with the CROP BOX UNCHECKED the thumbnail dimensions are proportional at 150 x 112 pixels and the medium image is the same and still no larger image. Re-sizing this way does retain more of the image than the CORP where you can lose some the image.
Although the default settings are usually adequate for most sites you can set these dimensions to suite your needs.
AUTO-EMBED
WordPress will attempt to EMBED media, such as a videos, into your post when this box is checked. But, for security, this embed feature is ONLY available from a list of of 16 sites that use the oEmbed code. If WordPress cannot use this embed functions then you will get a simple link.
MAXIMUM EMBED SIZE will restrict the embedded media to these dimension. If left blank then it will default to the maximum width of your site theme.
UPLOADING FILES enables you to control where the media is stored relative to your WordPress address. The default is set to wp-contents/uploads and is automatically created when you download your first media.
The FULL URL PATH TO FILES is used if you change the above line to another relative path other than the default. If you change the line above then enter the full path to the new upload directory.
The last check box will organize your uploads by year and then month. This is automatically done by WordPress. For instance if you download a file on July 4th 2010 then that image will be in a folder at wp-content/uploads/2010/07.
REMEMBER to save all changes before you exit.
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