If you are using Photoshop.
Please note that the landscape format is 1600 pixels wide by a maximum of 1200 pixels high.
The portrait format height is 1200 pixels, and the width will generally be in the 700 to 800 pixel range.
A square format will be 1200 pixels by 1200 pixels.
- Open up your image.
- Go to Image, Image Size and then a dialogue box will open up.
- Make sure that the Constrain Proportions is checked.
- In the Resolution box enter 72. Please make sure that the box next to it says Pixels/Inch.
- Then go to the Pixel Dimensions box at the top.
- For a Landscape format picture enter 1600 in the Width box, the Height box will come in under 1200 pixels.
- For a Portrait format picture enter 1200 in the Height box, the Width box will end up around 700 to 800 pixels pixels.
- Press OK.
- Save your image as a .jpg file, in a new location or with a new title so you do not overwrite the original one.
- You will also have to make sure that the image is converted to sRGB colour space by going to Edit, Convert to Profile and choose sRGB in the Destination Space. Then click OK and re-save the image. You may do this step first if you wish to save time.
Here is a link to Southport Society notes on How to Resize using Photoshop or Elements Click Here
And one from Karl Taylor, a well known photographer on the internet Click Here