I have been wanting to write a post on this for quite some time now. I have written a tutorial on how you can control the target size of an image when you click on it. This tutorial uses the same idea. When you upload an image to Blogger, you can resize them by clicking on the image once. But you are only allowed to choose between Small, Medium, Large, Extra Large and Original sizes. What if you want a custom size that is not defined by any of these selectable sizes? Sometimes, you have to make your post images really small to line up few images in a line.
You can easily adjust the size of your image to fit whatever size that you want it to be. See this image for example. I have adjusted the size of this image to fit the width of my main posting area, with some room to breathe at either sides of the image.