On 02/16/2012 03:18 PM, Daniel Smith wrote: > Hey all. I would hope this might get some responses... > > I just today saved my first png file. > In doing so Gimp came up with a choice box, as to parameters you can choose > or not: > > Interlacing (Adam7) (whatever that is) > Save background color > Save gamma > Save layer offset > Save resolution > Save creation time > > Can anyone tell me which of these options they use? > What does Adam7 mean?
Hey Daniel, Interlacing is a technique that enables web browsers to display an ultra-low-quality version of the whole image, that becomes progressively clearer while the image is still downloading. With modern Internet connection speeds, this is harmless but unnecessary. The background color, gamma, and layer offset features that are probably not relevant for your application; I have never found a use for them myself. Saving resolution may be useful in some exotic situations, but generally speaking web browsers will scale any image to the size specified in the (x)html tag that puts the image on the page. Creation time is just the system clock time when you saved the image, useful for revision control under some circumstances but probably not yours. PNG is a lossless format, so unless you are saving a lot of giant images and run short of time, there is no reason to dial back the compression from the default "9". > I am looking to create some web pages with drupal. > Can anyone tell me their process they use to do > a similar goal? (With drupal or WP, etc.) What I'm thinking > is that certain of the settings are compatible or not with > the blogging engine or not? do you use png or jpeg?, etc. Generally speaking, any blogging engine that allows you to mess with the (x)html should not do anything bad to your images. The server should just store them, along with the code that enables browsers to download and display them on the page. All of the above image formats should work. I usually use jpg format for nearly all web images, because comparable images saved in png normally have larger file sizes. The most potentially interesting feature of png is that it saves transparency, and *nearly* all web browsers now in use understand how to display png images with transparent areas. If you need a transparent background, and you need higher resolution or better scalability than the gif format provides, png might be your answer. Others may know uses for png that I am not aware of, but so far I have found no use for it in web design. You will probably be working from a template that specifies the position and size of some key images, such as a large header image. In these instances, build images to that specification. Other images can be placed freely in the main content and sidebar areas; in these instances, again, just make sure that the images you make fit the space provided. In re transparency, most of the time you will not need it. If you load the page under construction in a web browser and use the eyedropperin the GIMP foreground/background color tool, you can set the exact value to make an opaque part of your image match the page background exactly. In other instances, you might need to use transparency for something like an easy to change custom font text or logo appearing over a background image. In these cases, I usually build the image with the background image included, create a layer that has the text etc. merged into the background image, then do a selection and invert on a layer that has the text only, so that I can delete the background from the text+background layer cleanly. This gives much better anti-aliasing than just saving the layer with the text content. Example: http://avptampabay.org/demo/ Per usual, there are lots of ways to do these things, and mine may not be the one you end up using. :o) Steve _______________________________________________ gimp-user-list mailing list gimp-user-list@gnome.org http://mail.gnome.org/mailman/listinfo/gimp-user-list
