Rendera

Rendera is a graphic editing application that offers support for PNG, JPEG, BMP and TGA filetypes. It features some advanced photo filters and effects, such as color normalization and equalization, Gaussian blur, auto-correction, and dithering. Transparency is supported.

There is no installation involved, and all you have to do is extract the files to a custom location on the disk or directly to a USB flash drive to seamlessly run Rendera on any computer. It's wrapped in a single .exe file and also has a readme document. No changes are made to the Windows registry settings.

The software program's packed in a user-friendly interface made from a large window with a dark theme and well-structured layout, where you can open an existing image from file or create a new one by specifying the canvas width and height in pixels.

The drawing tools put at your disposal include stroke, line, color filling, polygon, empty or filled rectangle and ellipse, in addition to a color picker, rectangular selection, crop, panning, and text caption.

The color palette shows the hexadecimal representation of any selected color, enabling you to apply darken, lighten, colorization, alpha addition or subtraction, smoothening (simple, color, luminosity), and sharpening effects using alpha or reverse alpha.

Several preset color palettes are available in Rendera, such as black and white, 3-level and 4-level RGB, while new ones can be created by indicating the number of colors. They can be saved to GIMP palette (GPL), while new ones can be imported from the same format.

It's possible to flip, resize, scale and rotate the picture to any angle, as well as to dither the image using the Floyd-Steinberg, Jarvis, Judice and Ninke, Stucki, Atkinson or Sierra method while applying or disabling gamma correction and luminosity.

The photo effects revolve around color (normalization, equalization, colorization, value stretching, saturation, desaturation, hue rotation, color or alpha inversion), filters (Gaussian blur, mask sharpen and unsharpen, convolution matrix), artistic (stained glass, painting), FFT (forward or inverse FFT), and others (auto-correction, correction matrix, restoration, dust removal).

To sum it up, Rendera comes bundled with a bunch of advanced image processing tools and effects that mostly cater to experienced users, such as graphic designers or art editors. CPU and RAM usage was minimal in our tests.