#Image Compression
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the-compressor · 3 months ago
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can i ask what tool you use to compress?
also could you perhaps compress this image :)
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Compressed!
116KB -> 8KB ( 6.9% )
Sure. I'm going to be answering @slugcat-in-gundam's ask too because they sent it at a similar time with a similar question:
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I use GIMP for all image editing, besides occasional Lunapic.com usage. I did an FAQ on this on another gimmick blog a while back but I do different things here sometimes so I'll redo it anyways.
I got a higher quality version of your picture so the compression will be more noticable:
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All the compression done on this blog favors aesthetics over functions, which is why there's extreme dithering on everything: dithering isn't really something that's used at all anymore but I like how it looks.
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The main process is really just scaling the image down with linear interpolation to something between 64-256 pixels on the short side, and using Gimp's feature of letting you clamp an image to indexed colors, specifically with Floyd-Steinberg dithering on. If there isn't dithering, the picture will look like this:
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Then I just check the sizes they export at and post the image and that's it.
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If I want to make the image comically small and impossible to discern, I'll keep it as a jpeg and turn the quality way down at a tiny size:
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Which will end up looking like this.
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There are other techniques used sometimes, mainly on the #win98 pictures and #gba pictures.
With the win98 pictures, I scale them down to 320x240 or 160x120 every time and clamp the colors to the windows base palette, usually saturating the image before since the dithering doesn't look great otherwise. Look how this picture looks without vs with extra saturated colors:
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I forgot to mention before so I'm just jamming it here, but I'll also replace text in the font 3x3 mono if it's too small to be readable to keep the image legible sometimes. You'll notice this being done with fine print and watermarks sometimes:
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Here's the runthrough of that:
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Lastly, with the GBA pictures, it's about the same process but I just clamp the colors down to a number that the dithering is noticeable while the image is at the gba resolution. I never noticed until making this tutorial, but there's a positioned option for dithering too which I'll probably start using for these gba posts.
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That's about it. Here's the big version of the image you sent by the way:
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deersoncupcakes · 6 months ago
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we’re not so different; you and I
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codeandcanvas · 6 months ago
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Hello friend.
Drew this skull yesterday as a cool down drawing in Procreate, and today I went back to it, to push it more towards to what I want.
I have color processed it in Affinity Designer, and then exported it from there as gifs using the websafe palette, using 16 colors as a personal goal.
After having spent a few weeks on researching, I enjoyed making these as a proof of what I am currently looking for in my design: a lower density in detail, overall.
And I am looking for a pixelated look, like the ones above.
Yesterday, I was annoyed with how limited Photoshop for iPads is in terms of how much control I have over image compression during export and filetypes to export to (even had a few more caustic words for that), but today I realized that I can make do with Affinity Designer. It is a long shot away from the control I am used to, while the latter is also really far away from, say, ImageMagick’s capabilities (which I will test more when having a command line in front of me again). I obviously use what I have, but you won’t see me glorifying a make-do much.
I have a tendency to make drawings face to the left; that way, they seem to be facing me, like someone in front of me, if that makes sense to you. I flipped the skull for a couple of socials, added the first word that came to my mind, as sort of double-homage to both White Wolf RPGs and @plastiboo
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Enjoy this image compression of which we see so very few. This looks like a lot of fun coming my way.
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multitudescontainme · 1 year ago
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weezarddd · 9 months ago
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rendering time🔥🔥🔥
also really important question— how do i stop my ipad from compressing my photos??? like the quality in this sc is so bad 😭 every time i save a drawing, it ends up VERY compressed… help :’)
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elderscrollsconceptart · 1 year ago
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Just a general FYI. Tumblr's compression makes some of the images posted here appear in lower resolution than they actually are unless you enlarge them (I'm sure 99% of you knew this already ofc). Most of the images I source are in very high resolution.
If you're interested in a picture's finer details, try clicking on the image itself and pinch zoom (if you're on mobile). Some of the text descriptions from the artists are annoyingly hard to read otherwise.
Second FYI, some images I post *may actually* be in low resolution. I always look for the highest resolution I can find but some are just unfortunately low res.
-Khajiit voice-"May you walk on warm sands."
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jpeg-optimizer · 1 year ago
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Compress Image to Get Better Site Performance
Firstly, let's understand what exactly is meant by image compressor. In simple terms, it refers to reducing the file size of an image without altering its visual appearance. The most commonly used format for images is JPEG , PNG, GIF which offer a good balance between image quality and file size. However, not all image files are optimized for web use and may have unnecessary meta data or data that can be compressed further without affecting the image quality. This is where a tool like Jpeg Optimizer comes into play.
Jpeg Optimizer Tool is an online image compression tool that allows users to upload and compress image in various sizes. The tool uses advanced algorithms to analyze the image and identify areas that can be compressed without any loss of visual quality. It then removes unnecessary data from the image, resulting in a smaller file size. This not only helps in improving the loading speed of a website but also saves storage space. Follow us for more updates.
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I heard that out loud
*exports you as a jpeg* *and turns the quality waaaaay down*
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hip-hypocrite · 5 months ago
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big image containing details about this image compression format i'm working on
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in case you can't read my handwriting + this compression (very likely):
there are 2 big things in this algorithm:
first, the final image is made by tweening all the pixels between their 2 chosen sides. there are 15 permutations for animations (think about 3d stuff), and 6 permutations for static images. there is an option to use the 15 permutation option for static images anyway, where the "previous and next" frames are replaced by 2 "mood images". i thought this was a good idea since it's closer to a power of 2, but it's probably a bad idea for the same reason. anyways, as i was saying, every pixel is assigned a permutation of 2 directions, and it is some percentage one direction and the rest in the other. thus, gradients are smooth and easy to represent, and anti-aliased lines are also somewhat easy. the weights (percentages) used in the algorithm are determined by running the exact same algorithm for a grayscale image (this instance of the algorithm calculates in 5ths, i.e. 4 possible values not including absolutely one way or the other.) extra possibilities (1 for 15 permutation, 2 for 6 permutation) just refer to the pallet. these do not use the weights calculated in the first instance of the algorithm, instead they're just stored separately row-by-row, column-by-column with something like Huffman encoding. also if multiple weighted cells are chained together it's probably gonna take some algebra which computers don't usually like.
second, the algorithms for determining the individual bits of each pixel for calculating both instances of the first algorithm can either use some traditional encoding, or it can define regions by outlining them. which option is used for each is encoded within separate bits. all the typical encodings are calculated together, but since defining regions only works with binary bitmaps, the region encoding has to be done individually for each region encoded part.
you may be wondering how that mood image i talked about is defined. basically, there's one initial cell, that can be either subdivided into 4 cells, made a solid color, represent empty, or copy another region of the mood image. this image is stretched from it's initial size of a square with dimensions of some power of two, to the target size of the image. yeah, it's that simple.
anyways i dont know if this compression can be lossless for every image or just some images, if it's even good (i don't have confidence in it but that's what happens for all my projects) what it's pros and cons are, (im betting it compresses better for extremely large images). you may have noticed this mainly talks about the decompression. truth be told, i only have a rough idea of how to compress it. anyways, i'm gonna end it here, can anybody help me get a general idea of what this format looks like?
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productiveandfree · 7 months ago
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Why is it important to optimize design for the Web?
Optimizing web design is essential for improving user experience and boosting engagement.
Share in the comments below: Questions go here
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shayneysides · 2 years ago
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hobie: kill yourself
pavitr: WHAT THE HELL BRO WHAT DID I DO
original format from @ha-youwish in this post!
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bastionofbibliophiles · 9 months ago
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The texture on Random Woman's skin in this GIF is "dithering", which in this case is an effect used in image compression. Simply put, GIFs can't use as many colors as other image types. When a source image uses a color that isn't in the final GIF, that missing color is approximated by alternating pixel values between the two closest colors.
The bigger the pixels, the larger the dithered area, and the farther apart those "two closest colors" are, the more obvious dithering becomes.
You can reduce dithering by
using fewer colors in the image (for example, making everyone have the exact same skin tone instead of slightly different shades);
decreasing the image compression (meaning accepting a bigger filesize);
breaking a large image into multiple smaller ones (in this case, separating the single animated frame from the other non-animated frames), which (depending on software) allows for a bigger filesize budget for colors in each image instead of dividing one budget across the combined whole;
or, if the software allows it (Photoshop does; I don't know if Procreate does), you can manually specify which colors are most important to include in the GIF (in this case I'd pick the two skin-colors, the two shirt colors, the two blues in the sign and phone, and black and white) and let less-important colors get dithered (in this case, the smooth-shading at the transitions between line-art and fill-colors).
More Detailed Explanation of Dithering
Most digital-image-editing software represents color to the user with 8 bits of information for each of three color channels (Red, Green, and Blue) for a total of 24 bits per pixel, 256 possible intensities of each color channel (0 through 255), and 16,777,216 possible combinations of color intensities.
However, to reduce filesize, GIFs don't store the color of every single pixel separately. Instead, when you export a GIF, the software creates a color index table that can contain up to 256 color-triples (24-bit RGB values), and every pixel in the GIF is assigned one of those indexed colors, which requires at most only 8 bits per pixel instead of 24. This works fine if an image consists of solid blocks of color with sharp edges and fewer than 256 colors total, but breaks down quickly as soon as any sort of gradient or smooth curve becomes involved.
As an example, here is a PNG image of the full spectrum of 24-bit RGB colors, taking up 35,277 bytes:
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And here is that same image saved as a GIF with 256 colors, requiring 28,423 bytes:
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Not very smooth. Let's get a little crazy and drop that down to 8 colors, requiring only 5,217 bytes:
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Pretty ugly, right? How can we fix that?
The answer: dither it!
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This version still uses the exact same 8 colors, but by alternating between those 8 colors in patterns of different density, we can recover some of the appearance of smooth gradients. It doesn't look great, but it's there.
And while patterns require more bits-per-pixel than solid blocks of color, this 8-color version only takes up 22,958 bytes, compared to the PNG's 35,277 bytes or the 256-color GIF's 28,423 bytes.
[Note that I specifically chose to start with an image that contains as many colors as possible, with extremes as far apart from each other as possible, so the effects would be as obvious as possible.]
Extra Info
The difference in filesize between the dithered and non-dithered 8-color GIFs above is because GIFs use "run-length encoding": if multiple pixels in a row use the same index value (for example, a solid-white background area), the GIF will store one color value and one length value (e.g. "index 13, length 50", instead of 50 separate instances of "index 13"). The more big areas of a single color in an image, the more useful this is. When the entire image is heavily dithered (having run-lengths mostly less than 3, like in my extreme example), run-length encoding is basically useless.
PNGs can add smooth transparency by adding a fourth 8-bit channel, Alpha, to the RGB pixel values, bringing the total to 32 bits per pixel. Just like the color channels, Alpha can have values between 0 and 255, smoothly transitioning between fully-transparent and completely-opaque. In contrast, GIFs only support single-bit Alpha (fully-transparent or completely-opaque with no in-between), and the "transparent" color takes up one of the slots in the color index table.
When making an animated GIF, each frame is an entire separate image, all contained within one file. If you use one index position for "transparent", you can make every frame after the first be transparent everywhere except for the pixels that change between the current and previous frames. If the majority of the pixels are unchanged (like in this animated comic page), run-length encoding can dramatically shrink the filesize by condensing all those transparent areas into a few really long runs, at the cost of reducing the total number of available colors by 1.
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That's just how I stand...
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kbreducer · 9 months ago
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nyraa-james · 10 months ago
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raptorrobot · 1 year ago
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...like antennas to heaven
link to the full image
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bytebingtech · 11 months ago
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Image compressor tool
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