![]() avoid Photoshop's "Save for Web" function if your intention is a quality colour reduction Of course, if you are saving this as a still image, jpg should have been your choice in the first place, since it is a photo. This last version is visually (mostly) indistinguishable from the original, and clocks in at only 52kb. Here is a 512 colour version produced in Color Quantizer (Photoshop's SfW function lets us down once more, unfortunately: there is no option to reduce an image to 512 colours for PNG): Only use GIF when small animated movies are your goal. GIF is terrible in comparison to properly optimized and compressed PNG files. Far superior to Photoshop's failed effort.įourth, if you are still using GIF to optimize still images: STOP NOW. Even the woman on the right in the background looks spot on (which was yet another sore point in SfW's version).Īrguably the best version. The shoulder's highlight is also preserved nicely. The colours are all there, especially the important ones for the makeup and the smooth facial tones of Kate. There is slight banding visible in the lighter area of the wall on the right, but still much less pronounced compared to SfW's version. I painted a mask for the lips, the building and greenery in the background, the skin of the woman on the right in the background, the lighter area around the vent, and the forehead to preserve those areas' quality as much as possible. Much less grainy than Photoshop's version.Ĭolour Quantizer features a quality mask brush, which allows us to safeguard smaller areas with unique colours from colour degradation. Dithering was set to Shiau-Fan Slight banding in the lighter areas of the background, and the building and lips are again missing colours from the original. Next, let's try Color Quantizer with standard settings, a two factor gradient priority, and 256 colours. At the expense of smaller areas with unique colours. Overall, though, the final result is much less grainy looking than Photoshop's effort. Notice how the gradients are quite nicely retained, although here and there some issues pop up (lips/makeup, building, arm highlight, and greenery are missing colour). RIOT features a newer "NeuQuant neural-net" colour quantization algorithm. Next up: RIOT (Radical Image Optimization Tool). Obvious banding issues, and a very grainy result. The best visual quality I could achieve in SfW (diffusion dither at 81%, perceptual). Here is the original version zoom (32101 colours): For a good conversion you will have to look elsewhere. Second, Photoshop's Save for Web colour reduction algorithms are quite old-fashioned, and (far) better methods are available. Second, the quality of the GIFs you produced in Save for Web (SfW) prior to the purchase of the new laptop were never any "better" - it merely means that the previous screen was unable to display the results at a decent enough quality to actually discern the differences between the original and the GIF version with reduced colours. If you want to closely examine any one of the GIF frames, you can disable the animation and specify the frame number you're interested in.First, JJMack is correct: lots of colours (around 32100) in this example do make it harder to convert without grain. In the options, you can also find a section about GIF frame delays, frame sizes, and frame counts. The "Animation Preview" option lets you see the input GIF with the original background and the output GIF with the removed background. This option works only in the browser and illuminates the removal areas using black and white pixels. To see exactly which pixels will be removed and which will remain, you can use the "Alpha Channel Preview" option. For example, the percentage 0% means match just one color and 20% means match 20% of similar color tonality. In this option, you can specify the percentage from 0% to 100%. If the background of your animation has various shades of the same color, you can remove them as well via the shade matching option. Similarly, if you enter a mathematical color value "#0000ff", the program will remove all blue pixels. For example, if you enter the color "yellow", the program will remove the yellow background from the animation. The area that will be removed from the GIF is selected by matching the specified color in pixels of the frames. When the background is deleted, you can download the transparent GIF right away. If your GIF has a single frame (it's static), then it deletes the background from just this one frame. If your GIF is multi-frame (it's animated), then it loops over all frames and deletes the background from every frame. This is a browser-based program that deletes the background color from all GIF frames.
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