Posted by
Harry Parker on
URL: http://imagej.273.s1.nabble.com/1-file-type-question-and-2-file-size-question-tp3701811p3701814.html
You didn't say what format you selected for saving images. The TIFF format is the ImageJ default. Unfortunately, not many programs support TIFF. It is a good format for saving images losslessly, so that no detail is lost, but the files a very big.
If you are saving photos for illustrations (and not for measurements), JPEG is a good format choice. JPEG is universally supported, has good compression, but modifies the details of the image.
JPEG may or may not be a good format for saving images for measurement, depending on what you are measuring in an image. Each time you save an image in the JPEG format, more detail is lost.
This may also be the answer to your 2nd question. JPEG memory size and quality is adjustable. You can modify the output size of a JPEG file (number of KB) trading off size for quality. Try adjusting the JPEG Quality setting before saving a file as JPEG. (Menu: Edit->Options->Input/Output...) Note the resulting file sizes as you change the quality setting. The image size will vary with the image, depending on the amount of detail and sharpness of the image. Smooth, blurry images compress better.
I am interested in preserving fine details in most of my images and so keep the JPEG quality at 95. Depending on your needs a lower setting may work well for you and save much memory. Just be sure to reopen the file after saving it and inspect it carefully to see if the details you are interested in are preserved. If not, try a higher quality setting.
--
Harry Parker
Senior Systems Engineer
Dialog Imaging Systems, Inc.
----- Original Message ----
From: "SUGIMOTO, C" <
[hidden email]>
To:
[hidden email]
Sent: Friday, August 11, 2006 1:14:21 PM
Subject: #1 file type question and #2 file size question
Hello!
When I tried to save some photo files
from SAVE AS menue
" ???????????? " (many question marks) appeared to the file type box and those files were not able to be opened with powerpoint or paintnet, only opened with IMAGE J.
Original file was made with Macintosh photoshop. I used windows XP after that.
Does anyone have any idea what is wrong ?
Recently I asked about resize function of IMAGE J.
I found I can only change pixel number.
What I want to do it to resize big file size photo like 1-2MB to 500kb photo file.
Is that possible ?
I know I can do that with photoshop, but currently I do not have PC version of photoshop.
I would appreciate any help.
Thanks.
Chikage Sugimoto
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