Feed The Beast Wiki:Image uploading guideline

If the image you are uploading is a image that would be used in a grid (such as a Crafting Table) refer to the Grid images section.

For in-game screenshots refer to the Screenshots section.

Screenshots
At least one in-world screenshot should be used for every page. Screenshots should also be used to display and  features. Like biomes, at least one screenshot should be used for every page pertaining these subjects, if necessary. Some basic guidelines can be found below.
 * Always use the default texture pack; no third-party texture packs should ever be used to show an in-world structure.
 * Screenshots should not be too large or too small, use common sense when it comes to image size. 854x480 pixels is a decent size that should show correctly on all sized monitors.
 * Avoid using extreme Field-of-view (FOV) settings in-game. The Quake Pro setting should not be used unless it is absolutely necessary to capture a scene.
 * Avoid taking pictures with choppy or broken chunk boundaries.
 * Do not stretch/resize the images (cutting is okay).
 * File names should explain the use or contents of the image.
 * Biome images should be prefixed with "Biome_". After the underscore the biome name should be put exactly as it appears in-game.
 * If there is already an image of the name that is preferred to use, add _  or _ , without the angled brackets, to the end of the file name.
 * If possible, avoid screenshots that may confuse Color-blind users.
 * Screenshots should be taken during the day, unless darkness or nighttime is crucial for the screenshot.
 * Screenshots of the player should be taken using one of the default skins (Steve or Alex), unless the skin is crucial for the screenshot. The DefaultSkin mod can be used to easily disable your skin for the purpose of taking screenshots in Minecraft 1.10+.

Grid images
All grid icons for items and blocks use the tilesheet system. As such, there is a specific procedure to upload such images. Filename=In-game name Something else=/"Fancy":"Thing"\
 * The recommended way to obtain images of items and blocks is to use item panel dumps, which are a part of NEI (1.7.10 only) and BlockRenderer (1.8 and newer only).
 * Using NEI in 1.7
 * In the NEI filter dropdown double click on the mod you want to get images for, so that only that mod's items are displayed in the item panel.
 * In the dumps section of NEI options, perform an item panel dump of type 64x64 PNG. Larger than 64x64 is totally fine, leave them as is and do not resize them.
 * Using BlockRenderer in 1.8+
 * Find the mod ID for the mod you would like to get images for. They are found in the "mods" menu in the main menu.
 * Enter the Bulk Render GUI while in a world, and specify the mod's mod ID.
 * Set the render size to 64x64 and press render. Larger than 64x64 is totally fine, leave them as is and do not resize them.
 * If you are unable to use NEI or BlockRenderer dumps, then you will have to gather the images manually.
 * Obtain as many images as possible directly from the mod's assets.
 * For 3D rendered blocks, grab a screenshot and use a program like Gimp to crop it down to size and remove the background. Try to use screenshots with the GUI size as large as possible. Make sure the screenshots use PNG instead of any other format.
 * Do not resize/scale the images in any way.
 * Make sure the images are saved as.
 * The images should be named precisely as they are in game, including any punctuation and typos. For example, if you are adding an image for "4xIns. Garbage (blue)" then the image must be named "4xIns. Garbage (blue).png".
 * If multiple images have the same name, add a parenthesized suffix to differentiate them, for example and.
 * If an item name contains a character which is not part of a valid filename on Windows or Mac OS X (any of ), then use a name which is valid and then include a file named   with a line for each image which needs to be renamed like follows: (do not include the .png extension).
 * Stick all the images into a folder named with the correct abbreviation of the mod they are from.
 * Put that folder in an archive and upload it to a preferred file host (mediafire is popular). Then link it on the Tilesheet requests page.

Block images
Note that following these steps is important to ensure the highest quality for your block images.
 * 1) First use some sort of block image dumper like NEI or BlockRenderer to dump the block images at a very high resolution. 768x768 is a nice size for this, but it can take quite a long time to dump the images for large mods.
 * 2) Then acquire Rust, along with https://github.com/FTB-Gamepedia/ftb-rs.
 * 3) Put the dumped images into.
 * 4) Inside the   directory, run.
 * 5) You should now have lovely 192x192 block images ready to use inside.