Whether I shoot against my plain white backdrop or a background, my images are about 450-500kbs each. I easily edit them to less than 120kbs.
Here's my trick. Look in my gallery at my first pix and you'll find many irregular sized images with black or white irregular borders. I take the images and open them into Window's PAINT--most everyone has this.
In PAINT, I select from lower left (left column, second from bottom) function RECTANGLE, and choose the bottom one. This will allow you to make a solid whereever you drag-draw the rectangle. I shoot my images with more border than I need for this purpose, and use rectangle to blackout the unwanted space.
This alone reduces the image's kilobyte size dramatically, often to less that 100kb! Save and upload.
Nowadays, for aesthetics, I also load the blocked image into a photo program--I use any trialware and freeware, but usually use Adobe Photoshop's basic trialware--and use the CROP feature to hew away the blocked color from PAINT.
The results? Small pix sizes for speedy uploading and putting your gallery on a diet!
See my gallery for examples.












