Already saved file i.e, .PNG. Open the Photoshop Application , then go to file menu, and select the OPen, where u already saved file is .PNG select it click ok. it will in photoshop file .PNG the again go to file menu then click save as option the name it and format it as .GIF and click it save button.
Image file formats.
GIF and PNG 8 file formats.
.jpeg .png .gif
GIF image is a Graphics Interchangable Format. The interchangeable part of it's name means you can have a series of images "storyboard" shown as a mini movie in a .GIF image file.
GIF for images that contain 255 colours or less. Else JPG/PNG.
The most popular image/graphics file formats are: .Jpg, .PNG, and .Gif. PNG and Jpg are normal images while .Gif files can be short animated images.
jpeg is smaller (followed by png, gif and a bmp-which is largest).
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.
Portable Network Graphics (PNG) is a image format that employs lossless data compression. PNG was created to replace GIF (Graphics Interchange Format) as an image format that doesn't require a license. http://en.wikipedia.org/wiki/Portable_Network_Graphics
Portable Network Graphics (PNG) is a bitmapped image format that employs lossless data compression. PNG was created to improve upon and replace GIF (Graphics Interchange Format) as an image-file format not requiring a patent license. Meaning that the file does not loss any quaility; unlike JPEGS and GIFS.
.gif is a file format. Most commonly .gif files are animations or images with a short 5-10 second effect. Non-animation image file formats are: .Jpeg and .PNG.
most good image editors can make or edit both formats - they are both similar but each has advantages - gif can be used to make animations and has one level of transparency either on or off - png can have 256 levels of transparency and some image editors can work with pngs in millions of colors gif was the original internet image format but it was copyrighted and the creeps that designed it wanted to start charging everyone that used gifs a fee to do so - that is why png format was created, to give a free image format for the internet - but the attempts to collect fees for gif use didnt work and jpgs came along so the png format has been mostly neglected - but png format is a good one and all browsers as far as i know still support it