… defaults to FALSE for PNG, TIFF.
The logics is that in most case, when alpha is 0, you don't expect color
to be retrieved and some people were bothered by this when erasing data
with eraser tool or selection deletion.
For the WIP image as well as for XCF format, we definitely want to keep
color data as there are workflows where you would want to erase/unerase
pixels subtly (selection also are not binary and should not be expected
to erase color data on layers with alpha channel). So we want to keep
the non-destructive behavior there.
Yet for export formats, going for "deleting what looks deleted" is a
valid approach, especially as it has been argued that experienced users
would know how to read and change the format options (and these
experienced users are likely the ones who may have valid reasons to want
pixels with full transparency to keep color values).
PNG and TIFF were the only 2 formats where I see such options, so
changing the default for these 2 plug-ins.
(cherry picked from commit 105c4efc8b for
the TIFF one and adapted to gimp-2-10 code for PNG)
...always AdobeRGB!
Change all file plug-ins to never call gimp_image_metadata_load_finish()
with the GIMP_METADATA_LOAD_COLORSPACE when they loaded a color profile.
This keeps gimp_image_metadata_load_finish() from assigning a profile
from DCT even if the loaded profile was GIMP's built-in sRGB.
(cherry picked from commit a08293dc74)
While we tend to default to sRGB for 8-bit max formats (such as JPEG or
WebP) when no explicitly-assigned profile was set, there is no need to
do so for PNG too. Indeed since we have the ability to export 16-bit
PNG, let's consider this is ok to export 16-bit linear data when writing
GIMP's default linear profile.
Moreover let's follow the profile's (fallback to storage's) TRC also
when exporting to a specific precision (as chosen manually in the
dialog), not only when sticking to "Automatic", unless we are downsizing
a high bit depth work image to 8-bit without a manually assigned profile
(the only case we forcefully export as sRGB data, hence convert the
profile if linear storage).
(cherry picked from commit 24ed5870ad)
Similar to JPEG export (commit c5f7bac2ba)
as discussed with Ell. GIMP should follow and save as-is any *assigned*
profile. We only make a decision about whether to convert from storage
precision to another format when the profile is the default GIMP one.
... linear XCF.
When choosing a specific pixel format (other than "Automatic"), we
always export as non-linear. Therefore if we were going to save a linear
profile, make sure we also convert it to sRGB too.
(cherry picked from commit c5fae74ac1)
Add flag GIMP_METADATA_SAVE_COLOR_PROFILE to GimpMetadataSaveFlags and
initialize it from gimp_export_color_profile() in
gimp_image_metadata_save_prepare().
Adapt all plug-ins to use the bit from the suggested export flags and
pass the actually used value back to
gimp_image_metadata_save_finish().
This changes no behavior at all but creates hooks on the libgimp side
that are called with the context of an image before and after the
actual export, which might become useful later. Also, consistency
is good even though the color profile is not strictly "metadata".
(cherry picked from commit c667fdc5c0)
Set the libpng error_fn to NULL *after* png_read_end() not before.
png_read_end() can throw errors and we recover what's partially loaded
from an image in the error handler.
(cherry picked from commit db08271d16)
Various plug-ins exporting metadata should now follow preferences, which
would override any default. Of course these preferences can still be
overriden by saved settings (global parasite), previous run settings,
and finally through the GUI when interactive.
This is a privacy concern. Whereas importing metadata is usually a good
idea, exporting it should be a conscious action. A lot of private data
can be leaked through metadata and many people don't realize it (which
also usually means they don't need it). On the other hand, the people
who realize it are the ones who would explicitly edit the metadata and
check what they want to be exported or not.
This is only a first step. Some people may want to always export the
metadata and for these people, there should be abilities to change the
default.
...in both the core and libgimp.
Images now know what the default mode for new layers is:
- NORMAL for empty images
- NORMAL for images with any non-legacy layer
- NORMAL_LEGAVY for images with only legacy layers
This changes behavior when layers are created from the UI, but *also*
when created by plug-ins (yes there is a compat issue here):
- Most (all?) single-layer file importers now create NORMAL layers
- Screenshot, Webpage etc also create NORMAL layers
Scripts that create images from scratch (logos etc) should not be
affected because they usually have NORMAL_LEGACY hardcoded.
3rd party plug-ins and scripts will also behave old-style unless they
get ported to gimp_image_get_default_new_layer_mode().
Try to sort all GIMP_ICON_* defines into FDO categories like in
https://specifications.freedesktop.org/icon-naming-spec/latest/ar01s04.html
Add defines for all icons we override, rename some icons to their FDO
standard names, and mark the ones we duplicate with a comment so we
don't forget to rename those to standard names in 3.0.
When working in high bitdepth, manually changing precision to 8bit or 16bit is
an extraenous step, this adds a conversion step - but doesn't permit dithering
- and also doesn't permit using the palette modes of PNG. However it makes
workflows with single precision linear floating point much more usable.
with proper value names. Mark most values as _BROKEN because they use
weird alpha compositing that has to die. Move GimpLayerModeEffects to
libgimpbase, deprecate it, and set it as compat enum for GimpLayerMode.
Add the GimpLayerModeEffects values as compat constants to script-fu
and pygimp.
...an image with the color profile "sRGB IEC61966-2.1"
Eliminate libpng warnings about known incorrect sRGB profiles.
These "known incorrect sRGB profiles" are only considered "incorrect"
by libpng. Such profiles are perfectly good sRGB profiles currently
being embedded by PhotoShop 5 and 6 and also already embedded in many,
many images on the web.
Add support for writing linear PNGs. But only if we also save a color
profile, otherwise we would get loaders confused. Please test, I might
have a knot in my brain...
Also clean up some formatting and fix compile warnings, now let's wait
for bugs about shit libpng versions which break the build.
Return flags based on what metadata is actually present in the image.
Returning of a suggested value for GIMP_METADATA_SAVE_THUMBNAIL needs
support from gimp_image_metadata_load_prepare() and is still missing.
Port all plug-ins to use the new API, the suggested values are however
overridden by parasites and whatever special code was devised for the
individual plug-ins. This needs to be fixed.
Some libpng errors can safely be marked as nonfatal, which is much
better than simply failing in those cases.
Thanks to John Bowler for pointing out this solution.
and clean up the formatting of the call and the lines around it. Now
we can check the various (disabled) export options for regressions
again by changing a single line in gimp_export_image().
start with flags = ALL (which now includes all possible current and
future flags), and optionally *remove* individual flags instead of
adding them. This way the plug-ins default to TRUE for future flags.
So the plug-in has the chance to decide whether it wants to trust the
metadata information (e.g. resolution). Also reorder parameters in
gimp_image_metadata_save_finish(). Change all plug-ins accordingly.
Based on original patches from Hartmut Kuhse and modified
by Michael Natterer. Changes include:
- remove libexif dependency and add a hard dependency on gexiv2
- typedef GExiv2Metadata to GimpMetadata to avoid having to
include gexiv2 globally
- add basic GimpMetadata handling functions to libgimpbase
- add image and image file specific metadata functions to libgimp,
including the exif orientation image rotate dialog
- port plug-ins to use the new APIs
- port file-tiff-save's UI to GtkBuilder
- add new plug-in "metadata" to view the image's metadata
- keep metadata around as GimpImage member in the core
- update the image's metadata on image size, resolution and precision
changes
- obsolete the old metadata parasites
- migrate the old parasites to new GimpMetadata object on XCF load
The new by-row iteration doesn't re-write the length
value for each row. In general it is not safe to modify
the iterator data because the internal logic depends
on the public data, but this specific case is new.
