dubt about photo resolution...

hi guys!!!:biggrin:
i'm sorry for this stupid question.i would like to post a few photoes about my vfr and before to shoot them i ask you witch is the right resolution for the web...
thanks!!!:redface:
mikyvale

 

:bump: That is a great question mikyvale! I have been struggling with this too! You resize a picture and then it screws up the clarity. Hey, Puma Kitty, can you help us out here?????????:redface:

 

thanks norcalboy!!!
i apologize since now for my english...:redface:
i'l do my best for to write in correct form.:smile:
this site is useful for me,so i must to think in english,not in italian...
bye everybody!
mikyvale.

 

No worries, mikyvale! My typing is usually so bad that you can't tell it's english anyway, LOL! I have sent a PM to somebody around here that might be willing to help us out with this, I'm waiting for him to come over here and dispense with some knowledge. Be patient, he'll get back to us......:wink:

 

Sure can.
I use an image hosting service (ImageEvent) for hosting images you see here and at other web sites. When I prep an images for display on the web, I do something called "downsampling" which downsizes the native resolution (typically for my camera, 240 dpi) and the pixel dimensions of my camera's sensor. For example, my 12 megapixel Canon G9 produces images that are 4000 pixels wide X 3000 pixels high (4000 pixels X 3000 pixels=12 megapixels :smile at 240 dpi. That is way too big to display on a monitor and be able to see the image at 100%, So, you have to downsample.

The conventional dimensions for displaying photographs on the web are 800 pixels wide in the horizontal dimension X 600 pixels high in the vertical dimension. Images should be downsampled to 72 dpi resolution for display on monitors. This convention was set back when most folks monitors were smaller, so if we wanted to, we took take a poll and determine if members could accomodate a wider maximum dimension, say 1024 pixels wide. In all cases, the "dpi" should be downsampled to 72 as that is all the resolution that most monitors can display, 30" Apple Cinema displays notwithstanding (they support 100 dpi).

Here is an image with pixel dimensions of 800 X 535 at 72 dpi resolution:



Almost all image editing programs support downsampling through a command called "image size", for example in Photoshop or Photoshop Elements. This command will allow you to change the resolution of the image (dpi) as well. If your camera is capturing at say, 240 dpi (the default for Adobe Camera RAW, for example), you would type 72 in the resolution box, and your dimensions should change accordingly. You can then type the new dimensions in for the pixel dimensions of the image.

If you need examples, let me know and I will post them.

-PC

 

Thanks PC,

Just give me a little bit to read my camera manual, check out my photo program, and digest what you presented, If I need any more help, I'll let you know. I hope this helps mikyvale too.

 

Cool beans, NCB. Just let me know if you'd like a tutorial. I'm always happy to help folks out!

Cheers,
the 'ole Puma Cat...

 

Thanks Michael!

This is more of an issue with posting photos as an attachment. I like to resize the pictures so they can be viewed without having to shift the page to see the whole photo. When you are resizing down to the 480x360 size to accomplish this, the clarity of the image isn't really so great sometimes. I'm trying to get this figured out but I think it is going to be a compromise between the size and maintaining the clarity of the image......................

 

Retaining clarity really depends on the downsampling algorithm. When I downsample I use Photoshop and the Bicubic Sharper algorithm. This downsamples appropriately and does a good job of retaining detail.

 

Easy PC, LOL! I've barely got my head above water as it is! :biggrin:

 

No worries! :smile:

 

Nice Puma, thanks too for sharing that, all thou I've really never had a an issue with losing clarity downloading. it's usually lost when up loading to a lager size than shrinking. good to know that one.

 

ALWAYS shoot at the highest resolution possible. If you get that "once in a lifetime" photo, and you want to enlarge it to poster size, or even better, sell it, wouldn't you HATE it if you had shot it at 800x600 in the camera???

Assuming the use of Windows XP, the quickest and easiest way of doing a picture RESIZE (not a reduction in DPI) is to go to:

http://download.microsoft.com/download/whistler/Install/2/WXP/EN-US/ImageResizerPowertoySetup.exe

and install the powertoy, which is a MS program that is integrated into the right-click menu. Once installed you select the photo you want to resize, right-click on it, then select "resize". You can choose from 3 defaults, or any custom size. The image is then resized smaller and automatically renamed.

 

PUMA CAT...you are my technical guru !!!!!:biggrin:
as soon as i can i'll shoot photoes about my vfr and i'll post my photobook.
thanks for your clear explanation,especially for me that i'm not english mother language...:redface:
i go to sleep now(in italy now is 23.10 p.m)
have a nice day to you and everybody !
mikyvale

 

Ciao, Mikyvale, buona notte!