You should resize your photos before uploading your website, blog, or other online networking sites such as Google Plus, Facebook, etc.
If you take photos with your compact point and shoot camera or DSLR , your photo file size will be quite large. You do not need to upload original size of your images. It takes longer to load to the page, you also do not need to share your original images with the virtual world. Keep the original large photos to yourself and share on the web smaller file image copy of your images. You can compress and save as JPEG at 72dpi all your image files for the web. It will load faster, it will not keep too much space on your website server, therefore you do not need to pay for larger hosting space. Usually you do not need to display larger than 950px with images on the website, on your WordPress blog, unless you are a photographer or visual artist. Keep in mind most point and shoot cameras original images come as default 180dpi, and most DSLR camera photos come with 300/350 dpi image jpg files. This means images are high quality and ready for print. Not so ideal for viewing on the web though. You need to reduce the dpi 72 for web viewing. Once you reduce the image files, they will be upload and download much quicker on the web.

How to add watermarks to your photos using Picasa?

You can help protect your images by adding a watermark to your photos. A watermark in Picasa is white text that’s added to the lower-right corner of photos during the export or upload process. To add a watermark to a photo, please use the following steps:

During export
Select the photos you’d like to export.
Click the Export button in the Photo Tray.
Select the ‘Add a watermark’ checkbox.
In the watermark box, enter your watermark text.
Click OK. Your photos will be exported with your watermark in place.

While uploading
Before you upload, click Tools > Options (Windows) or Picasa > Preferences (Mac).
Select the Picasa Web Albums or Google+ Photos tab.
Select the ‘Add a watermark for all uploads’ checkbox.
In the watermark box, enter your watermark text.
Click OK. All uploaded photos will possess your chosen watermark.

Note that Picasa does not make changes to your original photo file. Exporting and uploading pictures with edits or watermarks applied creates an edited JPG copy of the original photo.

MAC Picasa view

References: https://support.google.com/picasa/answer/106193?hl=en

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I have been using Pixelmator to make basic editing on my photos.
If you are a Mac user and do not want to pay for Photoshop Elements or monthly payment Adobe Creative Cloud / Photoshop CC, you can start with much affordable solution. It is simple to use, very effective and you can get good result for your photo editing needs. It is super fast loading, works just fine with Wacom tablets. It has plenty filter effects to play with.

Pixelmator photo editing

Pixelmator takes full advantage of the latest Mac technologies, giving you speedy, powerful tools that let you touch up and enhance images, draw or paint, apply gorgeous effects, and just have fun with your pictures. Once your images are ready, access them anywhere with iCloud; send them to iPhoto or Aperture; email, print, or save them to popular image formats; or share them through Facebook, Flickr and more–all right from Pixelmator.

A powerful, pixel-accurate collection of selection tools
• Quickly and easily select any part of an image
• Edit and apply special effects to portions of your pictures
• Select and remove unwanted elements of your photos
• Cut out objects from one image to place in another

Top-notch painting tools
• Paint with Pixelmator as you would on canvas
• Use different brush sizes, shapes, hardness, and blending modes
• Adjust brush settings to get just the look you want
• Cover any area with beautiful gradients and color fills

Drawing tools
• Easily add, create, combine, and edit shapes
• Quickly add lines, circles, rectangles, polygons, and many more custom shapes
• Effortlessly apply shadows, fills, and strokes for more advanced shapes
• Create buttons, icons, web page elements, illustrations, and much more

Retouching tools
• Correct wrinkles and repair scratches
• Make flaws vanish from your photos, or improve compositions
• Remove unwanted objects seamlessly from their backgrounds
• Blur, sharpen, lighten or darken specific areas
• Get rid of the red eye effect with just one click
• Combine different tools and filters for an endless number of ways to refine your images

A real filter-machine
• Over 150 breathtaking filters and special effects
• Combine different effects for unique, near-effortless artistic creations
• See the stunning results in real-time

An elegant collection of professional-grade color correction tools
• Adjust exposure, hue, saturation, shadows and highlights, brightness, contrast and much more
• Replace and remix colors
• Dramatically improve less-than-perfect images with one click
• Designed for intuitive ease of use

Compatibility
• Send your images directly to iPhoto or Aperture
• Open and save images using PSD, TIFF, JPEG, PNG, PDF and many other popular formats
• Open and save Photoshop images with layers

iCloud, sharing, and saving for the web
• Let iCloud automatically store your edited images and seamlessly take your work to all your Macs
• Email your photos and image creations right from Pixelmator
• Publish your images to social applications like Flickr, Twitter and Facebook
• Optimize and save images for use on your web pages, blogs, photo albums and more

Built exclusively for OS X
• Pixelmator uses all the latest OS X technologies: Cocoa, 64-Bit, OpenGL, Core Image, iSight, Automator, Quartz Composer and much more

Best of Mac App Store 2011: App of the Year 2011
Apple Design Award Winner

More info: Pixelmator website

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