Preparing images in PhotoShopPhotoShop is a paid program for working with images. If you have PhotoShop, you can try the following steps:
Open the image in PhotoShop, and go to Image > Image Size...
In Pixel Dimensions change maximum dimension to 2500 (if larger than 2500)
- Click OK
- Go to File > Save for Web and Devices...
- Set the image type to JPEG and the quality to 60% and click Save. (Saving the image at 60% quality will create a smaller file size, but visually high quality image.)
- Check the Convert to sRGB box
- Click Save
- It may be a good idea to give your new image a slightly different name so it's easier to recognize when you go to upload it.