Although aimed at web design, it is more than just that. For example, Chapter 6:
Adjusting Images
Making Whites Whiter
Adding Tone Adjustments and Contrast
Making Colors More Vivid
Removing Color Tints from Photos
Darkening Areas on an Image
Lightening Areas on an Image
Fixing the Red-eye Effect
Converting Photographs to Black-and-white Images
Making Sepia Images
Matching Lighting and Colors between Images
Combining Two Different Images
Getting Rid of Dust and Scratch Marks
Smoothing Grainy or Noisy Images
Sharpening Images
Adjusting Dark Shadows and Bright Highlights
Summary
"Think what a better world it would be if we all, the whole world, had cookies and milk about three o'clock every afternoon and then lay down on our blankets for a nap." - Robert Fulghum
Ok, just checking this out ... you do have to provide an email address and click to ignore 'email alerts' ... "No thanks", at the bottom of the window dialogue that pops up when you click on the "Download Now!" button on the page.
We'll see what happens on the spam front. Just an f.y.i.., as I googled 'sitepoint spam' and of course ... some hits came back.
"Think what a better world it would be if we all, the whole world, had cookies and milk about three o'clock every afternoon and then lay down on our blankets for a nap." - Robert Fulghum
I downloaded it a few days ago and provided a 'second' email address I use for such things. There is so much spam arrives in it it is hard to judge of there has been any more. I said 'no thanks' then I got a message saying "hey not so fast" and something about visiting their sponsors.
I may have to get PS out of mothballs now.
"Think what a better world it would be if we all, the whole world, had cookies and milk about three o'clock every afternoon and then lay down on our blankets for a nap." - Robert Fulghum
And I finally had a chance to take a look at the 'book'. In particular, Chapter Six, as mentioned above.
Easy to understand. Screenshots accompany the explanations. Fairly well laid out.
And in skimming some other sections not specifically targeted to web page design and even then, much of the information imparted and learned stuff is transferrable ... I say ... 'thumbs up'.
"Think what a better world it would be if we all, the whole world, had cookies and milk about three o'clock every afternoon and then lay down on our blankets for a nap." - Robert Fulghum
I probably won't go for it as I've got a digital photography book by Tom Ang. I haven't had time to look at it properly yet, but I paid £10 for it in a charity shop (£25 new), then a few days later saw another copy on a coffee morning stall for 50p.
Sitepoint is a pretty respected site, so if you didn't sign up for any of the newsletters during the download process you should be fine as far as spam goes. However it is always a good idea to have a "throw-away" email address to use for any of these online offers.
"Think what a better world it would be if we all, the whole world, had cookies and milk about three o'clock every afternoon and then lay down on our blankets for a nap." - Robert Fulghum
(It is 64MB but a low-res 23MB copy also available)