When you have a WordPress site and you like to create a photo gallery, you should not try to upload photos to your website as it is ( large size photos ) from your camera. The image size will be too big for WordPress, most likely program will give error. Instead you should create a folder, resize images and give meaning names to images. It will be easier to organize them in your site if you give good names, otherwise the camera images names will be like this: DSC12345, DSC5678, DSC45678, etc. In long run, when you have many photos and photo galleries on your website, it will be too difficult to handle them, if the names are bunch of numbers : IMG_123, IMG_789, IMG_987.
So if you need to resize bunch of photos and you are using MAC, then you should download free iResize app.
iResize can resize, compress and save as JPEG at 72dpi the image files GIF, JPEG, PICT, PNG, TIFF and PSD files.
Easy and fast
Check before resizing with the new JPEG compression/quality preview
Rename and sequential numbering of the resized images, and/or
Add some text (example: -small) at the end of the file name
Handles accented characters (ü,ç etc.) in the file names
Rotation of single or multiple images
EXIF data reading
More info visit website: http://www.daniele.ch
If you are a PC user then you can try Fotosizer free software
Fotosizer is a free batch photo/image resizer tool. It lets you resize hundreds of photos in a matter of minutes in a quick and easy way.
Photos, represented as JPEG files from digital cameras, taken at high resolutions are far too large to send over the Internet, with some photos ending up at 5 -10 mega bytes. With Fotosizer, you can shrink JPEG image files, along with other supported formats, and dramatically reduce internet transfer times, enabling you to quickly and easily prepare your image collections to be published on the web. Fotosizer lets you resize in 3 easy steps, allowing you to choose the photos you want to resize, the dimensions, and where you want to save the new photos.
More info visit website: http://www.fotosizer.com
You can upload the following image types to a post or page on your WordPress website:
How to Upload Images from Your Computer?
Go to Posts -> Add New or Pages -> Add New, or open an existing post in editing mode.
Place your cursor where you would like the image to appear, then click on the Add Media icon above your post/page editor:
Then drag and drop your files into the box that appears, or click Select Files to choose a photo from your computer to upload.
For website viewing large image can be 950 px and resolution 72dpi is enough for web viewing.
When you insert large photo to your page/post keep them medium size , when visitor wants to see larger version, he/she can click on image and see pop up large version of that image.
Alternatively you may use a plugin to do resizing job.
Image Pro WordPress plugin is a totally different approach to Image and Media management in WordPress. Now you can easily add, edit, resize, remove images. It fully replaces WordPress image upload system with a completely new one, which is faster and more fun to use.
Photo Resolution: http://www.nurweb.biz/photo-resolution-matters-on-the-web/
Creating small thumbnails: http://www.nurweb.biz/creating-small-photos-thumbnails/
Image sizes and quality:http://codex.wordpress.org/Image_Size_and_Quality