No, it will not be harmful to your computer.
Normally delete the background in the image then when saving, save with the transparent option checked. This will give you a transparent background. PNG is different than GIF format because with PNG you get 256 levels of transparency which allows you to smoothly blend your image to the page background on a webpage. GIF has only one level of transparency so you get a pixelated edge to your image.
You can use an image viewer like Irfanview to save the image and use the proper image setting to save as a PNG. Or the same with an image editor like GIMP.
png
PNG is an image file format, such as JPEG or BMP. One of the differences between PNG and JPEG, is that PNG supports transparency.
youus ask bummie
To convert a JPEG image to a PNG format, you can use an online converter or image editing software like Photoshop. Simply upload the JPEG image and select PNG as the output format. Then, save the converted image to your desired location on your computer.
PNG image 80x80 pixels
PNG image 80x80 pixels
There isn't a way to delete, but I found a work around, you need a app called iFile it gives you access to your iPhone's internal directory, and the image is called autosave it has 3 or 4 of them labeled tmp png and some other i can't recall delete all of them.
PNG
A PNG image is a type of image file that uses lossless compression, meaning it retains high quality while reducing file size. To view or use a PNG image on an iPhone, you can simply open the image file using the Photos app, or use it in various apps for editing, sharing, or setting as wallpaper.
PNG stands for Portable Network Graphics. It is a type of image file format that supports lossless data compression, meaning that the image quality is not compromised when the file size is reduced. PNG files also support transparency and can display a wide range of colors. Unlike other image file formats like JPEG, PNG does not lose quality when the image is edited and saved multiple times.