Help needed - taking pic of brick house & brick

[jeniferrice]

always seem to have a moire effect (plays optical illusions) when I reduce the picture. It looks normal at 100%...what's up with that?

I'm using a Rebel XT and have tried taking the pic straight on and at an angle...still get the same effect when it's reduced to fit the webpage I'm adding it to.

Thanks in advance for any help.

Jen

 

[jann1033]

always seem to have a moire effect (plays optical illusions) when I reduce the picture. It looks normal at 100%...what's up with that?

I'm using a Rebel XT and have tried taking the pic straight on and at an angle...still get the same effect when it's reduced to fit the webpage I'm adding it to.

Thanks in advance for any help.

Jen

how small are you reducing it to? i found when i wanted to post samples of hub's work online ( some from my rebel xt some from a 4mp p&s) they worked better if i resized a copy of them in the pixel size i wanted..they were sharp then but if i tried to just reduce them they were not as sharp...i was making final sizes for posting at about 200x300- 400 ish pixels from either camera. i also found they looked best if i did all processing including resizing before i put them in the image gallery of the site i was putting them on. if they look ok before you make them smaller i would guess it isn't the way you are taking them since if anything i think you'd notice more detail in the larger photo...if i get what you are saying...i used pse5 to resize and i kept it as a small copy, keeping the original copy as well since i might want something bigger some day.

also if you are viewing in a smaller size( ie not a full size ) sometimes they just get pixelated( someone explained why but that escapes me) i think it's something how it displays them only using some pixels...that i noticed ie when i posted a small version of something like a bridge, the cables looked jagged but when it was full size it was fine..that was just the way the screen was displaying it and not really a problem with the photo and it looked fine full sized

 

[jeniferrice]

I'm reducing them to around 300x200 and they were taken with an 8mp digital. Like I said, they look great full size. Even when I reduce the viewing size down in PSE, they look funny at different sizes...as I reduce they look OK, then reduce smaller and they get that effect, but then they may even back out when I hit the right reduction ratio again.

I'll try physically reducing the pixel size in PSE before I link them to the website...hopefully that will help.

Thanks!

 

[Groucho]

It depends on how you're resizing/resampling them. I don't know if PSE lets you choose. If you use the free Irfanview (www.irfanview.com), you can pick from several different algorithms when resampling a picture - maybe one will work better than another, it's worth a try.

I don't think that there's anything you can do when taking the photo to reduce this effect, certain patterns cause this pretty consistently.

 

[jann1033]

algorithims just sound to close to "Math" for me to know what pse uses but i went to image, resize image, typed in the px, let it resample ( think it was bicubic, what ever the default is) and they looked good, surprisingly good considering the kodak 4mp i used in available light (since the surfaces of hub's samples are reflective and i can't use an on camera flash) was lousy in low light situations and was the camera i used on most of them. i really thought i was going to have to take all 300 plus samples over again in raw and didn't want to till i did the above. i still might but now i don't have to just to get his site up.

 

[Groucho]

Bicubic like PSE uses is very good, I just wonder if another way might reduce the amount of moire effects that the OP is seeing.

Resizing on the web is the same story - if you find better results when resizing yourself before uploading, then probably what resampling algorithm the web site uses isn't cutting the mustard, and/or it is saving the jpgs as a lower quality level. I can adjust those on my site but I'm on my own site using scripts I've chosen, I don't know which "normal" web galleries (Smugmug, Photobucket, etc) give you control over such features.