Image encoding, decoding, and format, size, and resolution conversion in Go

It could be necessary for some projects to encrypt and decrypt an image file from one format to another. Without an adequate understanding of the image byte of slice decoding and encoding of the image file, it will become a thorn and cause difficulty. So, our main goal today will be to grasp the encoding and decoding of byte slices from one file format to another, as well as resolution and size conversion in go.

Decoding / Encoding an image file from one format to another:

Decoding the specific file into a byte array is necessary as the first step in converting a file from one file format to another. After decoding, that byte array needs to be encoded into the appropriate file format’s byte array. For instance, if you needed to convert a tiff file to a jpeg, you would need to first decode the multipart.FileHeader of the tiff image into a byte array before encoding it into the byte array of the jpeg format.Contrary to the encode or decode methods that are provided for jpeg, png, and gif by image, additional dependencies for tiff and bitmap(BMP) must be installed in your Go project.

Install these dependencies in your Go project.

$ go get golang.org/x/image/tiff
$ go get golang.org/x/image/bmp

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Resizing, and resolution conversion of image:

We start by going back to the beginning of the image file for resizing. Next, the file is decrypted. After that, we must add the resize dependency to our project in order to reduce the image’s size and resolution to the appropriate level.

Install these dependencies in your Go project.

$ go get github.com/nfnt/resize

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So, this is how we can encode and decode images as well as change the format, size, and resolution of images in Go.