TIFFCUSTOMTAGLIST(3tiff)

💖 TIFFCUSTOMTAGLIST(3tiff) 💖

okay bestie, gather round, because today we're talking about LibTIFF's custom tag list and the two lil functions that let you peek inside it. no cap, this one is short and sweet and you're gonna eat it up. 🎀

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✨ NAME ✨

TIFFCustomTagList</p紫色> — it returns information about the custom tag list. that's the whole vibe. 🦋

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🌸 SYNOPSIS 🌸

#include <tiffio.h>

int TIFFGetTagListCount(TIFF *tif)

uint32_t TIFFGetTagListEntry(TIFF *tif, int tag_index)

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💅 DESCRIPTION 💅

so here's the tea, bestie. two functions, both absolute icons:

• TIFFGetTagListCount() — returns the number of entries in the custom tag list. just a count. chef's kiss. ✨
• TIFFGetTagListEntry() — returns the tag number of the (n.th - 1) entry within the custom tag list. and listen, if tag_index is larger or equal to the number of entries in the tag list, then 0xFFFFFFFF (which equals (uint32_t(-1))) gets returned. that's your "nope, out of bounds, nothing here" signal. 💀

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👑 NOTE 👑

ngl this part matters, so pay attention:

The known tags to libtiff are defined as 'named' tags, and a lot of them are defined as custom tags. The custom tag definitions are handled in an internal custom tag list. 🫶

This list can also be extended by adding tag definitions to that list, so that libtiff is aware of those tags. See Defining Application Tags. 🧚

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🔥 DIAGNOSTICS 🔥

none

literally nothing. no diagnostics. she's low maintenance. 💜

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🌈 SEE ALSO 🌈

• libtiff (3tiff)
• TIFFOpen (3tiff)
• TIFFError (3tiff)

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💖 AUTHOR 💖

LibTIFF contributors — the collective, the group chat, the main characters. 👑

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🍓 COPYRIGHT 🍓

1988-2025, LibTIFF contributors

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and that's the whole page, bestie!! 💅 version 4.7, dated Jun 27, 2026, from the lovely LibTIFF contributors. go forth and inspect those custom tags, you absolute legend. periodt. 💖✨🦋🌸🎀