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Hi @bertwim, there are several ways (of course) but the easiest is to use the https://www.libvips.org/API/8.17/property.ForeignSave.keep.html For example: image.write_to_file("x.jpg", VImage::option()->set("keep", "icc|xmp"));Will write the JPEG file with only icc and xmp metadata (ie. no exif). You could also do: image.write_to_file("x.jpg", VImage::option()->set("keep", ~VIPS_FOREIGN_KEEP_EXIF));ie. keep everything but exif. The vips main prog is handy for checking argument names and types: $ vips jpegsave
save as jpeg
usage:
jpegsave in filename [--option-name option-value ...]
where:
in - Image to save, input VipsImage
filename - Filename to save to, input gchararray
optional arguments:
Q - Q factor, input gint
default: 75
min: 1, max: 100
optimize-coding - Compute optimal Huffman coding tables, input gboolean
default: false
interlace - Generate an interlaced (progressive) jpeg, input gboolean
default: false
trellis-quant - Apply trellis quantisation to each 8x8 block, input gboolean
default: false
overshoot-deringing - Apply overshooting to samples with extreme values, input gboolean
default: false
optimize-scans - Split spectrum of DCT coefficients into separate scans, input gboolean
default: false
quant-table - Use predefined quantization table with given index, input gint
default: 0
min: 0, max: 8
subsample-mode - Select chroma subsample operation mode, input VipsForeignSubsample
default enum: auto
allowed enums: auto, on, off
restart-interval - Add restart markers every specified number of mcu, input gint
default: 0
min: 0, max: 2147483647
keep - Which metadata to retain, input VipsForeignKeep
default flags: exif:xmp:iptc:icc:other:gainmap:all
allowed flags: none, exif, xmp, iptc, icc, other, gainmap, all
background - Background value, input VipsArrayDouble
page-height - Set page height for multipage save, input gint
default: 0
min: 0, max: 100000000
profile - Filename of ICC profile to embed, input gchararray
operation flags: sequential nocache
$ |
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I was able to reproduce this issue when reverting commit 8092479, so the old logic for removing only EXIF data was somewhat flawed (i.e. it didn't check for |
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Ah, that is good news. FYI: I just built the latest git-version from github (version 8.18.0) and indeed, the problem seems gone. |
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@kleisauke I overlooked your earlier question on VIPS_FOREIGN_KEEP_NONE. After reverting to the Tumbleweed version that gave me the issue, I can confirm that with VIPS_FOREIGN_KEEP_NONE almost all metadata has been removed. |
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You can use the old and deprecated |
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@jcupitt Not necessary to go to a deprecated option. The VIPS_FOREIGN_KEEP_NONE is ok for now. I will wait for the next release to investigate the other possibilities. |
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It is still a mystery to me how to strip (exif)metadata from an image. I am using the C++-api, but the documentation (both C/C++) is rather incomplete on this topic and any attempt I have made failed.
Is there somebody who can give an example how to do this?
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