It sounds like your problem occurs before the image is cropped/ resized and displayed in the page – the original image is too small. You can require minimum dimensions for uploaded images, see: How to Require a Minimum Image Dimension for Uploading? Then, to resize the uploaded image without cropping it, define the image size … Read more
You can use this function, for example. Change for your needs and put on yours theme function.php file. add_image_size(‘Special’, 545, 365, true); add_image_size(‘Mobile’, 291, 197, true); add_image_size(‘Ipad’, 217, 147, true); add_image_size(‘Block’, 253, 172, true); add_image_size(‘Single’, 602, 358, true); add_image_size(‘Small’, 75, 49, true); add_image_size(‘Block-height’, 253, 245, true); add_image_size(‘Related’, 183, 124, true); add_image_size(‘Big_one’, 393, 266, true); On … Read more
Please try this plugin for regenerate image thumbnail and then try to display it.Thumnail regenerate plugin
There is a very good plugin that I believe covers all you are looking for, and more: Scissors Continued. I’ve been using it extensively on several websites, and recommend it.
I use the plugin Simple Image Sizes. If you do not want to use a plugin you have to use the function add_image_size
From my understanding on how WordPress crops, it’s not going to stretch your image to a certain size, so if you upload an image that is 300px wide, it isn’t going to stretch the image to 400px, it will keep that width and proportionally create a height. Make sure that Crop thumbnail to exact dimensions … Read more
Crop image with full width
Edit image results in copies of file being created
Forcing a user to crop the featured image in a certain aspect ratio
Show image crop window on image upload