I have a base64 image data which I want to save a png file. But When I save it as file, it does not retain the transparent portions but becomes fully black.
Is there a way to retain transparency while writing png file in Nodejs?
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I am Working on a small Image comparing script where the reference images are generated as SVGs and the compare images are PNGs.
I can transform the SVG files to PNG (using svglib and renderpm) but can´t specify the size I want them to be generated as(renderscale seems to cut of a part of the picture), but I need to get them to the same size for the compare functions and resizing the pngs nullifyes the whole purpose of vector graphics in itself. Any Ideas?
Regards a python noob
I have jpg file which is cropped for sure from original file.
In osx system I can see small thumbnail preview with whole image.
My question is: is jpg format allow to store whole image, and coordinates that describe how it should be cropped when you open file in any program?
Or is this small thumbnail somehow saved in this file as second resource?
What software do I need to check this? What keywords should I look in order to understand that better?
I'm looking for an all-in-one solution for processing web images
Resizing
Cropping
Save as WEBP / JPEG / PNG
Drawing simple rectangles
Adding text
Reducing colors (quantization) for PNG
The only thing I'm not clear about is PNG quantization. Currently I'm using pngquant which works great, but I'd prefer to do everything in one place.
I see the SkiaSharp has SKImage.Encode() which takes a quality parameter. However there's no explanation as to what it actually is. Will this give me color quantization for PNG files? If not, is there something else in the library to do this?
I'm trying to convert a Svg file which has a base64 encoded png in it.
Im trying to convert the file from svg to png using Imagemagick.
The problem being that the Svg converts (all the pure svg elements ie. text and such) but the png in the svg disappears.
Originaly i had alot of params added to the conversion but when i realized it wasn't working i striped it down to just this command:
convert /www/data/svg/201.svg /www/data/png/201.png
Original SVG:
201.svg
Result:
How to flatten images in PDF files with transparency?
convert PDF to PS (postscript)
pdftops input.pdf output.pdf.ps
If a PDF file contains eg. PNG files with alpha channel (transparency) the PDF is rendered/rasterized to an image and that is not a solution because then you lose the plain text in the file
Is there a tool (linux command line) to flatten images in PDF files with transparency?
Its not clear why you want to do this. If you want PostScript then Ghostscript can produce PostScript for you from a PDF file (use the ps2write device). Obviously transparency will have to be rendered to an image, in which case the resolution is important. The default is 720 dpi which is probably higher than you might need.
Note that a PDF file can't contain a PNG, that's not a possible image type in PDF. A PNG would have to be stored as an image with a separate alpha.