Editing Incubator escapee wiki:Basic bitmap image editing (section)

==Irfanview: Resizing and cropping==
 How to put image data int..o ..... ap!..propriate . size.
*For the reason of filesize. This is relevant for websites, and image collections (galleries)
*For preview purpose (so called thumbnail). Irfanview allows to put thumbnails from directory content into a single image.
*For detail purpose (only a particiualar detail is interesting, or border areas contain data which is not required).
*For "speedy display" purpose (the more tiny a file, it quicker it shows up/travels on the internet).

*Scaling and Resampling (for filesize purpose)<br>It is possible to scale via HTML attribute (img height= width=). This should only be used for variation about 50 percent.<br>It occurs that tiny thumbnails are indeed based on 500kbyte files. Scaling should be done in a way the information remains clearly visible.<br>Resampling is to amplify data by interpolation. It often works for up to double size for clear sources, but does not increase the amount of information. For this reason it is important to keep a "master" file in lossless format and maximal resolution. Any scaling should be done directly from the master (however often it does not make a big difference).<br>Size needs can differ much according to display hardware (the monitor). Hence it is good practice to show a directory (tree-like structure) of thumbnails, which link to images in high resolution. If the image display is static, then choose a filesize, which is possible to display within a few seconds, preferably immediately. Try to keep internet images around 50 kbytes, and test the page display under a slow connection.
*Resizing (to emphasize details)<br>In general, first crop out border areas, then adjust colors, then scale the image, and in the last instance probably reduce the color depth.<br>This guarantees as little processing loss as possible.

'''Select the Image menu.''' Then select "Resize/Resample".