Elizabeth567 wrote:.

Hi,I have the Sony Alpha 10.2 megabyte camera,.

Could this be megapixel?.

But all my photos comeout at about 2,000 to 4,000 kilobytes, even though I have thecamera defaults at the highest setting beneath RAW..

Sounds about right..

This createsproblems with pixellation when I decide to do a really closecropping of the photo, then print an 8x10 photo..

Again, this sounds about right. You may get slightly better results with RAW but the best solution would be to stop cropping before you print big..

Don't wait for the Nikon D-whatever, have fun now!http://www.flickr.com/photos/j_wijnands/..

Elizabeth567 wrote:.

Hi,.

This createsproblems with pixellation when I decide to do a really closecropping of the photo, then print an 8x10 photo..

For printing an image, you would normally aim to have about 300 pixels per inch. For an 8x10 image that would imply an image size of 3000 x 2400 pixels..

In practice you may be able to get satisfactory prints with smaller originals than this, but the trade off is a choice you make. For example an image of 1500 x 1200 pixels would be printed at 150 pixels per inch. Clearly there are consequences of cropping too much. Or if you must crop, print smaller.Hope this helps,Peter..

10.2 refers to the sensor, not the file created when the camera takes the picture.Dirck HarrisBug chaser/Dragonfly hunter.http://www.pbase.com/harry1/..

Dirck Harris wrote:.

10.2 refers to the sensor, not the file created when the cameratakes the picture..

That's right, the 10.2 figure comes from the total pixel count of 3872 x 2592. The actual file size depends on the image format and compression..

For a full resolution image at 3872 x 2592 pixels, an uncompressed image requires about 28.7 Megabytes of memory. Raw format stores this more efficiently because of the nature of the unprocessed image, so is rather smaller..

Any jpeg image would likely be substantially smaller than this theoretical 28.7 MB. But opening an image and saving as an uncompressed Tiff would require about that much space..

A jpeg image of 2,000 to 4,000 kB must have been compressed to about about 7 to 14 times smaller than the original. However, that does not cause a reduction of the number of pixels and does not necessarily mean the image will appear pixellated. That's because jpeg compression works by sacrificing a little bit of sharpness, and a little bit of colour accuracy, which is not normally noticeable to the eye, in order to achieve the smaller file size. Jpeg is actually remarkably good at doing the job it was designed for. It only starts to become a major issue when set to lower quality (smaller file size) settings.But if you must retain maximum possible detail, use the Raw format.Regards,Peter..

To avoid pixelization due to cropping too much, crop to the size you want then resize the image (increase it's pixel count). Maybe quadruple the pixel count; this'll make the pixels you are seeing when you look closely at the print disappear..

There's no magic here, that is, there's no more information is in the image, it is just smoothed out a bit. Use an image reziser that interpolates. Here's an example using Image-J; I resized the clown 2X in horizontal & vertical directions:.

Image control:Zoom outZoom 100%Zoom inExpand AllOpen in new window.

Dave..

Yes, you need to resize to print smooth images of a cropped image. Note you should choose the highest quality interpolation..

If you do this a lot you might want to investigate special software for this. I don't have particular experience of this software myself. I would expect ordinary software liek Adobe or the Gimp to do a perfectly good job..

If you find yourself cropping a lot to build an image, I'd wonder if you need to sit down and review your shot composition. Perhaps you could identify the framing styles you like and apply them when composing the shot - this might save a great deal of work and produce better results. When shooting take a few shots with different zoom lengths and framing so you can work from the most suitable one. I apologize in advance if this is not relevant, but as you post in the beginners forum it could be..

Good luck..

StephenG.

Fuji S9600Fuji S5200Fuji F30Fuji E900Canon A710ISPCLinuxOS..

Elizabeth567 wrote:This creates.

Problems with pixellation when I decide to do a really closecropping of the photo, then print an 8x10 photo.Hoping for your always-helpful expertise,Liz.

If you find you're having to do this a lot you perhaps need to work on technique and pre-visualization. Frame the picture you want before you press the shutter...

Wijnands wrote:.

Elizabeth567 wrote:.

Hi,I have the Sony Alpha 10.2 megabyte camera,.

Could this be megapixel?.

That's the problem precisely: she saw megapixels and thought megabytes...

Thank you so much! To quadruple the pixel count, how would I do it? When I crop, would I change the resolution from 300 to 1200? In Photoshop 2 Elements, it looks like when I crop I can change the photo size or the resolution, so it seems like I would do it in the resolution area, but thought I'd better double-check...Elizabeth..

Yes, I'm definitely working on framing too. I've been taking photos for 20 years (began with Pentax K100) and still frame too widely, alas!Elizabeth..

You are an incredible help, thank you!.

For a full resolution image at 3872 x 2592 pixels, an uncompressed image requires about 28.7 Megabytes of memory..

How does this work? Can you generally assume that each pixel takes about 0.00000286 MB of storage ([3872 x 2592] / 28.7 = 0.00000286 )?.

Elizabeth..

If you want to quadruple area just double width and height..

If you want to adjust height and/or width you would usually just enter the required numbers..

StephenG.

Fuji S9600Fuji S5200Fuji F30Fuji E900Canon A710ISPCLinuxOS..

Elizabeth567 wrote:.

For a full resolution image at 3872 x 2592 pixels, an uncompressedimage requires about 28.7 Megabytes of memory.How does this work? Can you generally assume that each pixel takesabout 0.00000286 MB of storage ([3872 x 2592] / 28.7 = 0.00000286 )?.

Yes. And 0.00000286 MB = 3 bytes..

But I should have explained it better. Normally we are dealing with 8-bit images. Data for Red, Green and Blue is needed for each pixel. That is 3 bytes.Total bytes = 3872 x 2592 x 3 = 30108672..

In the computer world, a kilobyte is generally understood as 1024 bytes, and a megabyte is 1024 x 1024bytes.So 30108672 bytes = 29403 kb = 28.7 Mb...

Elizabeth,.

There is an alternative. I have never resized images. Just use Qimage. I have been using it for years. It does the resizing for you:.

Http://www.ddisoftware.com/qimage/.

The program is well respected. You pay once and can upgrade as often as you like..

As you would expect there is a free trial download available. There is a bit of a learning curve but thereafter you need never resize images to print. If you do a search on Qimage on this site you will find many satisfied customers and lots of help with how to use the program which does much more than just help with printing. You can do most of your PP work in it including cropping.Chris Elliott.

*Nikon* D Eighty + Fifty - Other equipment in Profile.

Http://PlacidoD.zenfolio.com/..

Thank you so very much! I am an accountant, so all this detail just makes my day. I have plugged it into Excel so I can understand it in a familiar format.Thank you again :oDElizabeth..