Hi Stewart, I have ver. 4.6; is there no hope for my jpg files? The company I bought them from says it cannot offer tiff.
I tried bringing the image file into a photo editor and saving it as .jpg, and changing the extension on the world file. The graphics came in, at close to the same location (at least it was on the map in the same area) but the scale was no where near the same. Any hope? Pam Pam Lardear Run River Enterprises http://www.runriver.net 315-559-0526 "Helping you find your Way" -----Original Message----- From: berry_stewarttrancad [mailto:[EMAIL PROTECTED] Sent: Wednesday, January 12, 2005 9:51 AM To: [email protected] Subject: [Maptitude] Re: image files Hi Group: Maptitude 4.7 supports *.jpg files: The Joint Photographers Expert Group (JPEG) file format, named after the committee that wrote the standard, is based on a mechanism designed for compressing either full-color or gray-scale images of natural, real-world scenes. It works well on photographs, naturalistic artwork, and similar material; it does not work so well on lettering, simple cartoons, or line drawings. JPEG handles only still images (there is a related standard called MPEG for motion pictures). Maptitude can use pictures and images stored in JPEG files as layers in your map. JPEG is "lossy," meaning that the decompressed image isn't quite the same as the original image. JPEG is intended for compressing images that will be looked at by humans, because is designed to exploit known limitations of the human eye; you are more sensitive to small changes in brightness than to small changes in color. JPEG is a less-desirable image format than some others for two reasons. It is slow to display, because the file needs to be reread (starting from the beginning) each time a new portion of the image is displayed. Formats such as ECW, MrSID, and TIFF are designed so that portions of the image can be displayed by finding and reading only a part of the file. Also, JPEG has a fuzzy appearance and limited resolution, especially for large-scale display of map and other images with linework and text. Formats such as ECW and MrSID provide increasing levels of resolution as needed (to some limit) as you zoom to larger scales. To use a JPEG file in a map with other geographic layers, it must be accompanied by a JPEG/World (.JPW) file. This file contains registration information for the JPEG image, and Caliper registration information is added at the end of the file. The first time that you open a .JPG file and its .JPW file, they must be in a folder to which you have write access so that Maptitude can add the necessary registration information. Stewart --- In [email protected], "Pam Lardear" <[EMAIL PROTECTED]> wrote: > I just purchase an aerial photograph that I am trying to use with my > Maptitude. It comes as a .jpg with a .jgw World file. Is there any way to > use this with Maptitude, or to convert it to the TIFF and TIFF World? > > > > If not, can anyone recommend a good source for aerial photos that work? > > > > This is from Terraserver. > > > > Thanks, > > Pam > > > > > > Pam Lardear > > Run River Enterprises > > http://www.runriver.net <http://www.runriver.net/> > > 315-559-0526 > > "Helping you find your Way" Yahoo! Groups Links ------------------------ Yahoo! Groups Sponsor --------------------~--> In low income neighborhoods, 84% do not own computers. At Network for Good, help bridge the Digital Divide! http://us.click.yahoo.com/EA3HyD/3MnJAA/79vVAA/C5grlB/TM --------------------------------------------------------------------~-> Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/Maptitude/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
