Layers separate different “elements” when you’re editing an image on GIMP, Photoshop and other image-editing softwares. This helps you control the movement of each part of the images such as shadows, gradients, text and etc. When you create a layer, its size is the same as that of the image/canvas.
The wonderful thing about GIMP is that we can optimize its layers thus increasing control over the canvas. We can prevent useless area on a specific layer which enables users to know exactly the boundaries of each image.
… tests showed there is a significant decrease on the exported file size.
I have performed several tests to prove if “cropping” unused edges will create a difference on the file size. And results of initial tests showed there is a significant decrease on the exported file size. Let me clarify myself, by “cropping” unused edges, there was an increase in raw file (xcf). However, upon exporting to GIF or JPEG, GIMP’s exported file size decreased dramatically by almost 80%. That is a significant decrease especially to web developers, which means decreased download time which increases/faster loading time.
I will try to obtain images of my tests to show significant difference. Also, more test will be performed to prove the importance of this technique. So check it out soon.
Happy gimping everyone!