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One of the issues that was bothering me with the image quality evaluation project, was mission creep where we expanded from evaluating image quality to image content.
Image content is covered in the upload guidelines - There are wiki pages already for most of the forbidden content (although they need updating - will do that tomorrow, as in later today/tonight)
I reorganized the image wiki to focus on the image quality and direct content questions to the existing wikis. I also gave it a lighter touch - the language was a bit heavy and I worry about the TL;DR effect. Further, people who bother to read this are already interested in doing the right thing.
evaluating image quality tutorial revision
Uploader's tutorial:
Unlike many of the booru image boards, Konachan is a Moderated image site dedicated specifically to high quality anime wallpapers. Moderators remove any images that do not meet Konachans upload guidelines and quality.
So what makes an image worthy to be a high quality anime? Image content and image quality.
Image content:
The image must anime related and drawn in an anime style.
This includes both official and fan art related to Japanese animes, visual novels, interactive visual novels (games) and mangas.
Original artwork drawn in the amine style.
The Image must not contain any of the following content as stated in the <Upload Guidelines>:
It is highly recommended to spend some time browsing through Konachan's image library to familiarize yourself with the image content and quality of the posts - and what a good opportunity to refresh your screensaver images with a few downloads!
Image quality (The Technical details):
There are many image defects for which Konachan's Moderators evaluate new image posts. Most of these defects are obvious once you are aware of what to look for. If you read the following tutorial you too can evaluate images with the same savy and critical eye as Konachan's Moderators.
Image orientation:
A computer wallpaper must fit the computer screen, so for most people that is Landscape
Konachan requires a minimum Aspect Ratio (AR) of 1.15 peferably 1.33 or 1.77 to match standard computer monitors.
All approved images on Konachan are Landscape.
Moderators delete any Portrait uploads on sight.
The Aspect Ratio can be calculated for any image by dividing the number of Horizontal pixels by the number of vertical pixels. For example 1024/768 = 1.33 AR
A perfect image can be ruined by saving it using lossy compression formats.
If an image is available in .PNG (Portable Network Graphics), this is the Preferred format, which supports lossless compression and layers.
If an image must be saved as .JPG actually JPEG File Interchange Format (JFIF), make sure to use the highest quality setting.
Konachan does not accept any other image formats.
Note: Uploading a JPG when a PNG is available will not make you popular on Konachan.
3D Images:
Anime/manga styled images are usually 2D (2 dimensional) but 3D images are allowed. Computer rendered 3d images with a coarse mesh will exhibit low resolution and/or choppy lines
Animated GIFs are short sequences of images in a continuous loop. While rare on Konachan because of the minimum resolution requirements, GIFs that otherwise meet Konachans resolution and AR requirements are permitted.
Screen captures, or screen caps for short are saved images usually from Computer Game CGs. These images seldom meet Konachan's quality requirements as these images are usually sourced from highly compressed video material and contain visible compression_artifacts (discussed below).
The general rule of thumb: If a Moderator can tell that an image is a screen capture, it will get deleted.
Image quality (Editing Images):
Many times otherwise great images may be portraits, have borders, or otherwise require editing, cropping, rotation to meet Konachan's upload guidelines. There are many such images on Konachan, but beware of the following pitfalls:
File formats:
Many image editing programs default to low quality JPG, check the settings BEFORE saving your work!
If the original image was a PNG - Save it as a PNG.
If the original image was a JPG - Save it as a JPG, there is no advantage converting a JPG to a PNG.
Note: Never use Microsoft Paint to edit an image, it always highly compresses JPGs. If you don't have a professional image editor, GIMP the GNU Image Manipulator is free and adequate.
Cropping an image:
A poorly cropped image may meet Konachan's AR requirements, but be aesthetically unpleasing, even jarring. Watch out for cutoff elements and other cropping failures:
For various reasons you may come across an image that is distorted. Such images can often times be made acceptable by judiciously stretching the image to restore proper perspective.
Color edits are a way of converting a portrait image on a solid color background to a landscape image. When the color does not match exactly, it will be visible in the final image. Before uploading an image, you should always check the background. A TRICK is to tilt your monitor in any direction and look at the image. Try this trick on the examples below.
Rotation is another way to convert a portrait image into a landscape, it may even look better than the original, but if done poorly, the image may look unnatural in the new viewing angle. Beware of such elements as text, water, and the effects of gravity on hanging elements. Such unnatural appearing images will not be approved.
Konachan automatically checks all uploaded images for existing similar images using a MD5 hash to compare images and will flag similar/duplicates. If your upload is flagged, you need to check that your image is either sufficiently different and/or higher resolution.
A watermark identifies the artist or studio that created the image. A logo is an official eblem of the copyright or artist. An image may also be signed by the artist. As long as these marks were created by the original artist and are not excessive the image is acceptable.
Poor linework and aliasing artifacts both address the same problem; rough and jagged lines. Poor linework is due to the artist's lack of ability to draw a fluent line, making characters and objects, in an image look blocky. Aliasing is when certain parts of the image or even the whole image appears pixelated.
Never upscale an image. The resolution will be expanded but the original lines and elements don't follow. As a result, the image is ruined.
Example of upscaled image (compare to the original. The original image was too small for uploading on Konachan so someone tried to upscale it so that it would meet the resolution criteria and as a result, the image is now ruined).
"Artifacts" is a general term for imperfections in an image. Artifacts can be distorted pixelations or lines that are not clear, blocking in the image and excessive quantization in color depth and/or contrast from excessive compression.
A clever TRICK of spotting jpeg artifacts is to zoom in on the image to about 200%. You can do this by pressing and holding the "ctrl" button on your keyboard while using the "scroll wheel" on your mouse (note that this tip is for Windows-operated systems).
A second TRICK is to look at the file size. Is it JPG and <500 kb, while the resolution is >1280x720p. Find the color red, sharp edges and zoom in to 200% and you will see the JPG artifacts. Try this trick in the 3 examples below.
Regarding artifacts, the same guidelines go for Game CG's but since these kinds of images are generally available as PNG files, the guidelines are a little stricter.
If the above 3 example images had been game CGs, all of them would have been deleted.
Raw scans:
When scanning an image on a computer, take care to eliminate dust, skew and creases, especially the latter if the image is from a book.
Moderators regularly delete images that don't meet Konachan's technical requirements, but some images just don't look right and are left unapproved for 3+ days. These images are deleted. The reasons vary - contrast issues, blurry, excessive or unfortunately placed text....
When uploading images on Konachan, at some point, you may find yourself tempted to share your own works. Just remember that the same guidelines and criteria goes for user made images as well as the rest of the images on the site.
Kiho
almost 10 years agoImage content is covered in the upload guidelines - There are wiki pages already for most of the forbidden content (although they need updating - will do that tomorrow, as in later today/tonight)
I reorganized the image wiki to focus on the image quality and direct content questions to the existing wikis. I also gave it a lighter touch - the language was a bit heavy and I worry about the TL;DR effect. Further, people who bother to read this are already interested in doing the right thing.
evaluating image quality tutorial revision
Uploader's tutorial:
Unlike many of the booru image boards, Konachan is a Moderated image site dedicated specifically to high quality anime wallpapers. Moderators remove any images that do not meet Konachans upload guidelines and quality.So what makes an image worthy to be a high quality anime? Image content and image quality.
Image content:
- The image must anime related and drawn in an anime style.
- This includes both official and fan art related to Japanese animes, visual novels, interactive visual novels (games) and mangas.
- Original artwork drawn in the amine style.
- The Image must not contain any of the following content as stated in the <Upload Guidelines>:
-
furry, yaoi, guro, toon, poorly drawn art, Explicit loli, bestiality
- Do not upload images with obnoxious watermarks
All the magenta colored terms above link to wiki pages for more information.- Example of content not related to anime
- Example of content that is not drawn in anime/mange style
It is highly recommended to spend some time browsing through Konachan's image library to familiarize yourself with the image content and quality of the posts - and what a good opportunity to refresh your screensaver images with a few downloads!Image quality (The Technical details):
There are many image defects for which Konachan's Moderators evaluate new image posts. Most of these defects are obvious once you are aware of what to look for. If you read the following tutorial you too can evaluate images with the same savy and critical eye as Konachan's Moderators.Image orientation:
- A computer wallpaper must fit the computer screen, so for most people that is Landscape
- Konachan requires a minimum Aspect Ratio (AR) of 1.15 peferably 1.33 or 1.77 to match standard computer monitors.
- All approved images on Konachan are Landscape.
- Moderators delete any Portrait uploads on sight.
The Aspect Ratio can be calculated for any image by dividing the number of Horizontal pixels by the number of vertical pixels. For example 1024/768 = 1.33 ARExample image with adequate resolution but near the minimum AR.
Image resolution:
- The image must have a resolution at least equal to a standard computer monitor.
- 1024x768 minimum for a (4:3) 1.33 AR - standard screen display.
- 1280x720 minimum for a (16:9) 1.78 AR - wide screen display.
- 1000x700 is a hard cutoff below which Moderators are required to delete on sight.
Example image below minimum resolution but adequate ARFile formats:
- A perfect image can be ruined by saving it using lossy compression formats.
- If an image is available in .PNG (Portable Network Graphics), this is the Preferred format, which supports lossless compression and layers.
- If an image must be saved as .JPG actually JPEG File Interchange Format (JFIF), make sure to use the highest quality setting.
- Konachan does not accept any other image formats.
Note: Uploading a JPG when a PNG is available will not make you popular on Konachan.3D Images:
Anime/manga styled images are usually 2D (2 dimensional) but 3D images are allowed. Computer rendered 3d images with a coarse mesh will exhibit low resolution and/or choppy linesAnimated GIFs (Graphics Interchange Format)
Animated GIFs are short sequences of images in a continuous loop. While rare on Konachan because of the minimum resolution requirements, GIFs that otherwise meet Konachans resolution and AR requirements are permitted.Screen captures:
Screen captures, or screen caps for short are saved images usually from Computer Game CGs. These images seldom meet Konachan's quality requirements as these images are usually sourced from highly compressed video material and contain visible compression_artifacts (discussed below).Image quality (Editing Images):
Many times otherwise great images may be portraits, have borders, or otherwise require editing, cropping, rotation to meet Konachan's upload guidelines. There are many such images on Konachan, but beware of the following pitfalls:File formats:
- Many image editing programs default to low quality JPG, check the settings BEFORE saving your work!
- If the original image was a PNG - Save it as a PNG.
- If the original image was a JPG - Save it as a JPG, there is no advantage converting a JPG to a PNG.
Note: Never use Microsoft Paint to edit an image, it always highly compresses JPGs. If you don't have a professional image editor, GIMP the GNU Image Manipulator is free and adequate.Cropping an image:
Distorted images:
For various reasons you may come across an image that is distorted. Such images can often times be made acceptable by judiciously stretching the image to restore proper perspective.Color edits and background extensions:
Color edits are a way of converting a portrait image on a solid color background to a landscape image. When the color does not match exactly, it will be visible in the final image. Before uploading an image, you should always check the background. A TRICK is to tilt your monitor in any direction and look at the image. Try this trick on the examples below.Rotation:
Rotation is another way to convert a portrait image into a landscape, it may even look better than the original, but if done poorly, the image may look unnatural in the new viewing angle. Beware of such elements as text, water, and the effects of gravity on hanging elements. Such unnatural appearing images will not be approved.Image extractions.
Part of an image can be extracted from the one image and placed into another image. If this is done be sure to check if the lines are fluent.Duplicates:
Konachan automatically checks all uploaded images for existing similar images using a MD5 hash to compare images and will flag similar/duplicates. If your upload is flagged, you need to check that your image is either sufficiently different and/or higher resolution.Watermarks, Logos and Signatures:
A watermark identifies the artist or studio that created the image. A logo is an official eblem of the copyright or artist. An image may also be signed by the artist. As long as these marks were created by the original artist and are not excessive the image is acceptable.Linework and aliasing:
Poor linework and aliasing artifacts both address the same problem; rough and jagged lines. Poor linework is due to the artist's lack of ability to draw a fluent line, making characters and objects, in an image look blocky. Aliasing is when certain parts of the image or even the whole image appears pixelated.Upscaling an image:
Never upscale an image. The resolution will be expanded but the original lines and elements don't follow. As a result, the image is ruined.Artifacts:
"Artifacts" is a general term for imperfections in an image. Artifacts can be distorted pixelations or lines that are not clear, blocking in the image and excessive quantization in color depth and/or contrast from excessive compression.A Note about Game CG's
Regarding artifacts, the same guidelines go for Game CG's but since these kinds of images are generally available as PNG files, the guidelines are a little stricter.Raw scans:
When scanning an image on a computer, take care to eliminate dust, skew and creases, especially the latter if the image is from a book.Replacing images:
Images on Konachan can be replaced for several reasons: Artist revisions, higher resolution image....Aesthetically unpleasing artwork:
Moderators regularly delete images that don't meet Konachan's technical requirements, but some images just don't look right and are left unapproved for 3+ days. These images are deleted. The reasons vary - contrast issues, blurry, excessive or unfortunately placed text....User made wallpapers:
When uploading images on Konachan, at some point, you may find yourself tempted to share your own works. Just remember that the same guidelines and criteria goes for user made images as well as the rest of the images on the site.It is easier to be an editor than a writer!