Hi Pam I would definitely recommend upgrading to 4.7. Otherwise any image conversion software used may degrade the image.
Stewart At 10:06 AM 1/12/2005 -0500, you wrote: >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 Links > > > > Stewart J. Berry (BSc, MSc) GIS Specialist E-mail: [EMAIL PROTECTED] Phone: 617-527-4700 Fax: 617-527-5113 Caliper Corporation 1172 Beacon Street, Newton, MA, 02461-9926, USA Web site: http://www.caliper.com ------------------------ Yahoo! Groups Sponsor --------------------~--> Has someone you know been affected by illness or disease? Network for Good is THE place to support health awareness efforts! http://us.click.yahoo.com/RzSHvD/UOnJAA/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/
