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Bumpmaps, Resizing, Sharpening
So since the bumpmap has a limit of 128x128 pixels,i want to
resize the 512x512 original image and try not to lose quality.

In the end this thread will be a tutorial about making your own bumpmaps
from your textures,resizing them and making them as clear as we can.

this guide is for gimp

choosing the file type to save the project:
http://ubuntuforums.org/archive/inde...t-1569799.html
XCF is a file format which is special because it is GIMP's native file format: that is, it was designed specifically to store all of the data that goes to make up a GIMP image. Because of this, XCF files may be quite complicated, and there are few programs other than GIMP that can read them.

When an image is stored as an XCF file, the file encodes nearly everything there is to know about the image: the pixel data for each of the layers, the current selection, additional channels if there are any, paths if there are any, and guides. The most important thing that is not saved in an XCF file is the undo history.

The pixel data in an XCF file is represented in a lossless compressed form: the image byte blocks are compressed using the lossless RLE algorithm. This means that no matter how many times you load and save an image using this format, not a single pixel or other image data is lost or modified because of this format. XCF files can become very large, however GIMP allows you to compress the files themselves, using either the gzip or bzip2 compression methods, both of which are fast, efficient, and freely available. Compressing an XCF file will often shrink it by a factor of 10 or more.

The jpeg format uses a compression which tries to get rid of parts of the image most people won't notice anyway. As you compress the image smaller and smaller, the changes gradually get more noticeable.Thats why you work on the file as .xcf then save as .jpeg so you don't lose but the smallest of data which is not noticeable to the eye.

sharpening technique
Smart sharpening guide
This technique does two “smart” things to avoid sharpening noise:

1. sharpen only the luminosity channel, and
2. create a channel mask that contains only the edges in the image. Then you can load the channel mask as a selection and apply the unsharp mask to just the edges.

the guide



the guide says its image >mode >decompose but its
colors > components > decompose
and
colors > levels



useful links:
How NOT To Make Normal Maps From Photos Or Images
Last edited by WorldEater; Oct 28, 2017 at 03:38 PM.