I know Photoshop pretty well, and been working with it for like 4, 5 years, but somehow, only recently, i noticed that when i rotate a picture (Picture 1), and aply it, my edges somehow get corrupted and pixely (see picture 2).
How can i avoid this? Does it have something to do with the fact that when i am making something, i do it in 300 dpi, and the fact that the screenhsot in thix example is 72 dpi (because of the printscreen) ??
I am buffled really.. haven't noticed this happening before, but maybe i just didn't worked with screenshots that much..
Help apreciated..

never actually noticed it, u cant see it tho if u dont know tis there

Are they pixel-ley after applying transformation?

I just tried it with a print screen and yes it is more pixelly when doing it with 300 dpi rather than the normal 72.

Quote from DTrott :

Are they pixel-ley after applying transformation?

Yes, only after rotation, try it.. When u paste the screenshot, it's normal, the edges are fine, but when i rotate it, they get pixely...

It happens, and from what I know of the only way to get rid of it is to make a HUGE image and resize down.

Edit > Preferences ...

General > Image Interpolation

Check if it is set to some bilinear or bicubic variant. If it is set to nearest neighbour, you will get results like you are getting.

If this doesnt help, maybe look for a tickerbox that says Anti Aliasing that might have been switched off somehow.

Or try pasting it saving it as something higher quality like a .png and then rotating that, does that work?

Quote from Frankmd :

Edit > Preferences ...

General > Image Interpolation

Check if it is set to some bilinear or bicubic variant. If it is set to nearest neighbour, you will get results like you are getting.

If this doesnt help, maybe look for a tickerbox that says Anti Aliasing that might have been switched off somehow.

Ok, i am at work now, and this Photoshop is set to "Bicubic (better)" and i rotated some 72 dpi screenshot on 300 dpi new file, and it seems fine, i didn't noticed those corruptions..
I will see when i get home, how is my Photoshop set up..
Thank you very much guys!

Strange, I find that double clicking to "set" the transformation makes all the jagged lines go away.

Quote from spookthehamster :

Strange, I find that double clicking to "set" the transformation makes all the jagged lines go away.

Of course, i wasn't talking about those jagged lines..
It's after the transformation they remain (but not that much while not transformed) jagged..
As it seems, it probably has something to do with that interpolation thing.
I'll see when i get home what the results would be..

Just so we're clear, you're talking about the appearance at 100% view, yeah? In the first screenshot, the image is being viewed at 67% and that will always display on-screen in poorer antialiasing than at true 100%.

Photoshop does offer antialiasing options on scale/rotate functions.. ensure that you have antialiasing turned on in your options/preferences.

Quote from SamH :

Just so we're clear, you're talking about the appearance at 100% view, yeah?

Off course, at 100 %... that first pic is just an example of what rotation i am talking about.

Quote from SamH :

Photoshop does offer antialiasing options on scale/rotate functions.. ensure that you have antialiasing turned on in your options/preferences.

Hmm, there is antialiasing in some of the tools, but there isn't when i am rotating via "show bounding box" or with the "CTRL + T" option..

Just do what Frank said, that is what your problem is

I missed Frank's post. That's the one.

Quote from SamH :

I missed Frank's post. That's the one.

So, the right picture is with "Bicubic"?
Great, great!.. thank you guys so much.. :bowdown:
Testing it when i get home..

Red background is "nearest neighbour", which I think yours is set to. The green background is "bicubic". Depending on your preference, you should test out all Bicubic options available

Wierd stuff happening to my computer.
I got home and i start Photoshop and it says, "Bicubic better"..
I rotate a picture of 72 dpi on a 300 DPI file, and the edges are fine, can't see the difference.
I set to "Bicubic smoother" and it's same.
So, i thought, maybe it's only screenshots from LFS that gets corrupted, so i took another screenshot, rotated it on 300 dpi, and the edges are fine..
I got really confused, so i set it up to "nearest neighboor", although my Photoshop "aparently" ran in "Bicubic better" mode, and rotated it again, and edges got corrupted.. like on that first example..
It seems that my Photoshop ran in "nearest neighboor" mode lately, but somehow swithed to "Bicubic better" when i got home... twillight zone..
Can this somehow switch from one mode to another on it's own??
As you see from the pictures, the "nearest neighboor" mode is to blame here, but i can't comprehend how it switched back to Bicubic when i returned home...
Anyway, thanks for your help guys, maybe someone will learn from this, as i did..

I guess it was just some hickup or something. If it is some image-specific thing, then all I can think off is that the image is not in RGB mode (some mode with less colors) and then the yaggies are created because there are not enough colors. But I dont think that applies to your problem, looking at the screenshots...


Anyway, it would be nice if they put the sampling method option in the Transformation tool-menu. Every time you want to check how a certain transformation looks with a different sampling method requires going into settings...

Why not just tilt the camera in LFS and then take the screenshot? That saves you from the quality loss resulting from doing it in your software. It should look better than any post-production job will and will save you some time.

Quote from Gunn :

Why not just tilt the camera in LFS and then take the screenshot? That saves you from the quality loss resulting from doing it in your software. It should look better than any post-production job will and will save you some time.

That's indeed the best way.

Also, another tip wich goes for everyone. If you're transforming an image like rotating or rescaling it in Photoshop, you will always lose quality everytime you do it. If you rightclick on the layer in the layers menu and select Group into new smart object, this will keep the picture on optimum quality. Afterwards, rasterize the Smart object and it's editable again.

For that you need CS2, correct? Unfortunately I found CS2 working a lot less fluently on my desktop then CS... Haven't tried it on my laptop yet, though.

Quote from Frankmd :

For that you need CS2, correct? Unfortunately I found CS2 working a lot less fluently on my desktop then CS... Haven't tried it on my laptop yet, though.

Correct.

Quote from Gunn :

Why not just tilt the camera in LFS and then take the screenshot? That saves you from the quality loss resulting from doing it in your software. It should look better than any post-production job will and will save you some time.

Yes, i did that.. but, what if i want to drop that screenshot on some very small banner, or something, if i want to fit in some angle of that screenhshot on that banner, so i have to rotate it..
Anyway, that optin from CS2 looks interesting, but CS2 worked very bad on my computer, once i was doing some design of over 100 layers, and when i wanted to save it, it displayed some strange error, so i had to do it all over again.. Since than, i don't use CS2..
But, right now, with that "Bicubic" interpolations, i don't have jagged edges, so it's all good now.

This is how I'd describe Adobe CS2 - and bare with me this is quite a technical and long-winded analysis...


It's a piece of bloatware sh*t.

Quote from spankmeyer :

This is how I'd describe Adobe CS2 - and bare with me this is quite a technical and long-winded analysis...


It's a piece of bloatware sh*t.

Works perfectly for me. Lookin forward to when I get CS3!