How to convert graphics to color per point by Alone Coder There was a question about how to convert graphics to "EGA" mode ATM Turbo. If you just need a photo with dithering: 1. In Photoshop, adjust the brightness/contrast/color to make it more palatable. 2. Convert ~30 colors to an adaptive palette. But we don’t use this palette. On the contrary, we try to fix it manually. 3. Each color is manually matched to ATM colors (i.e. with components 0/85/170/255 - according to measurementsLVDthere should be 0/93/162/255, but I'm not sure what the authors of ATM Turbo wanted these values; however, the difference is insignificant). If there is options, where to round - we make a couple of color options (all equally there will be many matching ones in the palette). 4. Let's see how many different colors we got (apply convert to RGB, select the “exact” palette). If less than 16, then adding color options. If there are more, then we remove rare ones shades (if they can be conveyed using shading by others flowers). 5. Apply the palette. Dithering can be adjusted from 30%up to 100%. 6. Convert again to RGB. 7. Convert to an “exact” palette - already exactly 16 colors. 8. Save as 4-bit BMP. During the palette selection process, you can periodically save the palette, apply, cancel the result... Hippiman offers the following option: ──────────────────────────────── ───────────────────────────────┐ It is necessary to smoothly reduce the number of colors in the image to minimal. It is best to do this in several steps. First, you need to experimentally convert the image to an adaptive palette without much loss of quality. Usually this about 60-70 colors. Next you need to “merge together” similar colors, if possible fitting them to the ATM palette. We try to get rid of small areas of rare occurrencecolors. Then we convert to RGB and repeat the procedure several times until there will be about 30 colors left. ───────────────────────── ─────────────────── ───────────────────┘ If you need to convert hand-drawn graphics (as in Nedodemo 2), then fuss more. You need to manually go through several options sequences of colors instead of each color transition original palette. Sometimes you have to sacrifice one or another color (merge it with the neighboring one). If you need 50% shading, then first we convert the image to ~30 colors with components 0/42/85/128/170/212/255, then we look for the ATM a palette with which you can shade the desired colors, and then we manually convert each color field into shading (all together it is impossible - clear 50% shading does not work). I didn't find faster way than copying the selected color fields to another document (initially white), setting 3-color palette (white plus two colors, between which fits exactly as specified) and conversion with diamond shading. Then copy back what happened to the original document. Converting to paletteDDp (RХGЧB4) is easier - just convert to adaptive palette and save. When cuttingleast significant bits There won't be much difference in color. In which case it is possible in the process conversion to adaptive palette manually round components colors, then apply the palette. SoftwareDiHalt Visitors for batch conversion of BMP to packed memory dumps are posted here: http://alonecoder.nedopc.com/zx/convega.rar By the way, there is a special program fromTmK that converts in two flickering screens, color per point. But she doesn't know how to pick palette
Share your thoughts about the article