spada wrote:Hi
Using CS to fix would cut your pic res down , in some cases after being fixed it became 6MP pic instead of 8 MP , I do not talk about pix peeper here, just say that it like crop and rotate picture.Correct me if I am wrong.
Strictly speaking, no, but I think I know what you're trying to say.
Let's see if I can explain this in terms my cat can understand.
Or perhaps that even I can understand.
Resolution is basically the number of photosites per whatever. Typically measured in Dots per Inch (dpi) and on the D70 we're talking 300. I suspect that the 350D and 30D will be at the same dort of density, and that provides a very fine level of resolution.
When you straighten an image in an image editing program, what you're doing is shifting the pixels along an axis. In so doing, you're moving the vertical and horizontal edges of the image - which, at the outset, are true vertical and horizontal references - so that they are no longer truly horizontal and/or vertical.
However, you're still trying to work with a rectangular image, and thus the image that you're seeking to produce as final output must now be taken from a rectangle that is sourced from within your (now) offset polygon, and by definition, this new rectangle, and thus your new (final) image, must have smaller linear dimensions than your original source image.
And thus your final image must also be of a lesser size in terms of pixel count. An image that might have been 8MP in its original form might now be 6.8 MP because of the reduction of the rectangle from which this image was derived.
So ... you have a smaller image, dimensionally, and in terms of pixel count, but you have done nothing that would change the density of the image resolution, so if it was originally shot as 8MP at 300dpi, it might now be 6.8MP but still at 300dpi.
It's a slightly smaller image, that's all.